[#14] Created code parsing module. Added aleppo dependency for preprocessing source code.
[#14] Parsing completed. Implemented conversion from abstract form to a uniform map representation.
[#14] Implemented to_map clauses for remaining reserved words.
[#14] Implemented nesting_level rule.
[Closes #14]  Removed unused function from elvis_code and added this module to the coverspec.
[#14] Added more tests cases for the nesting_level rule. Modified .gitignore file.
Merge pull request #43 from inaka/jfacorro.14.nesting.level.rule

[#14] Implement nesting level rule