Adding build tags for building with WebKit2GTK < 2.2
fixing tests for < 2.2
updating authors, readme for raring
Merge pull request #4 from bryansum/master

Adding build tags for building with WebKit2GTK < 2.2
adding basic rgba snapshot support
updating GetSnapshot comments and test
updating GetSnapshot comment
Merge pull request #5 from bryansum/master

Adding basic rgba snapshot support