GBCommentsProcessor: Refactor handling of URLs inside method calls

This provides much simpler handling of the change in https://github.com/tomaz/appledoc/commit/3485e4199b0fe62cbadbccb3fb705921cdee8b75
GBCommentsProcessor: Refactor -[GBCrossRefData matchesObject] for readability
GBCommentsProcessor: Change NULL to nil since GBCrossRefData is now an object
Set up for Travis CI
Merge pull request #369 from paulmelnikow/comments_processor_refactor

GBCommentsProcessor: Refactor handling of URLs inside method calls
Merge pull request #370 from paulmelnikow/refactor

GBCommentsProcessor: Minor changes
Merge pull request #371 from paulmelnikow/travis-ci

Set up Travis-CI