cleaned up documentation

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### Usage
To use the SQL parser in your own projects you simply have to follow these few steps. The only requirement for is GCC 4.8+. Older versions of GCC probably also work, but are untested.
**Requirements:**
* gcc 4.8+
To use the SQL parser in your own projects you simply have to follow these few steps. The only requirement for is gcc 4.8+. Older versions of gcc might also work, but are untested.
1. Download the [latest release here](https://github.com/hyrise/sql-parser/releases)
2. Compile the library `make` to create `libsqlparser.so`
3. *(Optional)* Run `make install` to copy the library to `/usr/local/lib/`
3. Run the tests `make test` to make sure everything worked
4. Take a look at the [example project here](https://github.com/hyrise/sql-parser/tree/dynamic-library/example)
4. Take a look at the [example project here](https://github.com/hyrise/sql-parser/tree/master/example)
5. Include the `SQLParser.h` from `src/` and link the library in your project
### Development
**Prerequisites:**
* [bison](https://www.gnu.org/software/bison/) (tested with v3.0.2)
* [flex](http://flex.sourceforge.net/) (tested with v2.5.5)
**Requirements for development:**
* gcc 4.8 (or newer)
* [bison](https://www.gnu.org/software/bison/) (tested with v3.0.2)
* [flex](http://flex.sourceforge.net/) (tested with v2.5.5)
First step to extending this parser is cloning the repository `git clone git@github.com:hyrise/sql-parser.git` and making sure everything works by running the following steps:
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We strongly encourage you to contribute to this project! If you want to contribute to this project there are several options. If you've noticed a bug or would like an improvement let us know by creating a [new issue](https://github.com/hyrise/sql-parser/issues). If you want to develop a new feature yourself or just improve the quality of the system, feel free to fork the reposistory and implement your changes. Open a pull request as soon as your done and we will look over it. If we think it's good then your pull request will be merged into this repository.
### Documenation
### Resources
* [Working Syntax Examples](docs/syntax.md)
* [Known Issues](docs/issues.md)
* [Developer Documentation](docs/documentation.md)
* [Integration in Hyrise](docs/integration.md)
* [Working Syntax Examples](docs/syntax.md)
* [Developer Documentation](docs/dev-docs.md)
### License

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Developer Documentation
=======================
This page contains information about how to extend this parser with new functionalities.
## Developing New Functionality
This section contains information about how to extend this parser with new functionalities.
### Implementing a new Statement
## Implementing Statement Class
Create a new file and class in src/lib/statements/ or extend any of the existing Statements. Every statement needs to have the base class SQLStatement and needs to call its super constructor with its type. If your defining a new statement type, you need to define a new StatementType in SQLStatement.h.
Create a new file and class in `src/sql/` or extend any of the existing Statements. Every statement needs to have the base class SQLStatement and needs to call its super constructor with its type. If your defining a new statement type, you need to define a new StatementType in `SQLStatement.h`.
It is important that you create an appropriate constructor for your statement that zero-initializes all its pointer variables and that your create an appropriate destructor.
Lastly you need to include your new file in src/lib/sqllib.h
Finally you will need to include your new file in `src/sql/statements.h`.
## Extending the Grammar
### Extending the Grammar
Related files:
* src/parser/bison_parser.y
* src/parser/flex_lexer.l
* src/parser/keywordlist_generator.py
* src/parser/sql_keywords.txt
````
src/parser/bison_parser.y
src/parser/flex_lexer.l
src/parser/keywordlist_generator.py
src/parser/sql_keywords.txt
```
To extend the grammar the file you will mostly have to deal with is the bison grammar definition in src/parser/bison_parser.y.
To extend the grammar the file you will mostly have to deal with is the bison grammar definition in `src/parser/bison_parser.y`.
If your extending an existing statement, skip to the non-terminal definition for that statement. I.e. for an InsertStatement the non-terminal insert_statement.
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## Implementing Tests
Related files:
* src/sql_tests.cpp
All test related files are in `test/`. Take a look to see how tests are implemented.

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@PROJECT_NAME = "SQL Parser for Hyrise (C++)"
@OUTPUT_DIRECTORY = docs/__doxygen__/
@GENERATE_LATEX = NO
@GENERATE_HTML = YES
@INCLUDE_FILE_PATTERNS = *.y *.l
@FILE_PATTERNS = *.y *.l *.h *.cpp *.md
@INPUT = README.md \
docs/ \
src/parser/SQLParser.h \
src/parser/SQLParser.cpp \
src/parser/bison_parser.y \
src/parser/flex_lexer.l \
src/lib/ \
@RECURSIVE = YES

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Integration in Hyrise
=====================
On this page we describe how to integrate changes to the parser into Hyrise.
## Update the Parser code in Hyrise
Run `./deploy_to_hyrise.sh path/to/hyrise` to update the SQL parser code within Hyrise.

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Known Issues
============
Here we will keep track of issues with the parser and the integration in Hyrise.
## Missing Functionality
* Union clauses
* Create anything other than tables
* Alter/Rename statements