Add spec for cobertura xml coverage service.
Add cobertura xml coverage service.
Add nokogiri to Gemfile.
Add basic setup of cobertura report file.
Add subtype of CoverageFile named CoberturaCoverageFile.

Contains simple parser to bundle the file's lines of code by methods.
TODOs:
- ignore comments inside methods
- skip lines between '/*' and '*/'
Add simple implementation of cobertura xml generator.
Use Nokogiri::XML::Builder to create xml document.
Refactor and fix parser bugs.
Improve pattern matching.
Add TODOs.
Set correct filename and class name in xml class node.
Set correct filename and class name in xml class node.
Merge branch 'feature/cobertura_reporter' of github.com:tarbrain/slather into feature/cobertura_reporter
Cleanup code.
Refactor method parser.
Improve parser for methods.
Cleanup code.
Updated error message.
Cleanup code.
Enhance cobertura_xml_spec.