Refactoring of ScaladocAutoEditStrategyTest

The previous test class was difficult to work with because input
and expected output must be handled manually. The new test class
can compare input and output directly and is also able to check
the correct cursor position.
Refactorings in AutoCloseBracketStrategy

Since the old test suite is error prone, a new one is created. The new
test suite is able to compare full input and output and not only the change
events.

Furthermore AutoCloseBracketStrategy is renamed in BracketAutoEditStrategy
because the existing auto edit actions do not only close brackets.
Merge pull request #266 from sschaef/issue/auto-edit-strategy

Refactorings in AutoCloseBracketStrategy
Merge pull request #263 from sschaef/issue/comment-auto-indent

Refactoring of ScaladocAutoEditStrategyTest