RavenClient: added additionalExtra/additionalTags parameters to captureMessage method
RavenClient: added additionalExtra/additionalTags parameters to captureException method
RavenClientTest: added tests for additionalExtra/additionalTags
Updating contributors
RavenClient: indentation fixes
RavenClient: adding ability to ignore default tags
RavenClient: making comments look nice
Merge pull request #25 from dvor/master

Adding more options to customize