Fixed build -  keyword was removed from scalariform
Merge pull request #419 from dotta/transient/fixed-build

Fixed build -  keyword was removed from scalariform
Add syntax highlighting for task tags in comments

The behavior that detects task tags works nearly the same way as it
works for JDT. In fact most code is a copy of the JDT components,
which could not directly used because of incompatible super classes
and different preference stores.

Fixes #1001450
Update Scaladoc with task tag highlighting

It turned out that he new introduced `ScalaCommentScanner` can
be used to simplify `ScaladocTokenScanner` a lot.

The old test suite is completely deleted because the complete logic
it tested could be deleted too. The deletion stands in favor over
a migration to the new logic. This is because most logic is now done
by components of the Eclipse API. Furthermore the new code relies
on UI components that can not be tested on the build server.