Yaml-extender

-----------------------

- Bugfix: Using references as default values works now as expected. Issue6
- Bugfix: For loops should now resolve correctly if given as part of a dictionary. Issue2
- Bugfix: For loops will not reverse the order of the elements. Issue4
- Bugfix: Referencing lists in other lists will now extend the lists correctly. Issue5

Tests:
- Added: Added tests for above fixes
- Bugfix: Fixed problem with system test being cwd dependent.

-----------------------

- MAJOR Changed: List indices are now accessed by separating the index with a dot instead of using casual array access syntax.
- Changed: Reworked reference resolver to work in a recursive manner
- Changed: Update documentation

- Added: Option to resolve list of dicts
- Bugfix: Accessing elements of dictionaries passed as include parameters now work properly.

-----------------------

- Bugfix: Syntax error
- Added: Inline Loop feature. Strings can now be extended using loops.
- Changed: accepting absolute filepaths now.

-----------------------

- Bugfix: Boolean values are not parsed correctly when set in include parameters.
- Changed: Numeric values for arithmetic operations are now parsed strictly.
- Changed: Improved README documentation.
- Added: For loops will now accept multiple iterator statements and create permutations for it.

-----------------------

- Bugfix: Including files, which represent a list value is now possible.
+ Added additional tests for that

-----------------------

- Changed: occurences of list refs in string will now resolve as whitespace separated string.
- Changed: resolving lists in lists will now extend the current list.

- Bugfix: Include Resolver will now resolve subsequent values in dicts.