Preliminary support for comments
Starting ti implement infrastructure to properly handle the .rel files
Implementing the loading of relationships according to the object model
Automatically loading relationship tree
Further implementation of relationship structure
Merge branch 'master' of github.com:weshatheleopard/rubyXL into comment_support

Conflicts:
	lib/rubyXL/parser.rb
Merge branch 'master' of github.com:weshatheleopard/rubyXL into comment_support

Conflicts:
	lib/rubyXL/objects/theme.rb
	lib/rubyXL/parser.rb
Merge branch 'comment_support' of github.com:weshatheleopard/rubyXL into comment_support
Merge branch 'master' of github.com:weshatheleopard/rubyXL into comment_support
Moving generation of overrides to more generic location
Drawing support
Merge branch 'master' of github.com:weshatheleopard/rubyXL into comment_support

Conflicts:
	lib/rubyXL/objects/content_types.rb
	lib/rubyXL/objects/worksheet.rb
	lib/rubyXL/worksheet.rb
Extending relationship support to charts
Finalizing the first pass at relationships
Removed lock as per recommendations
Merge branch 'master' of github.com:weshatheleopard/rubyXL into comment_support