Fix dependency on `org.junit4`.

In Kepler, there's only one bundle, `org.junit`.
Removes references to JavaStringAutoIndentStrategy

This is an internal JDT class, and its constructor changed between Juno and Kepler.
It was a blocker to be able to use the same build on both Juno and Kepler.
Less non-API reference is better.

The features lost are the one defined in the 'In string literals' in
Preferences>Java>Edito>Typing. They are about managing multiline content in simple string literals.
They didn't really make in the Scala context, where multiline string literals can be used.
Merge pull request #459 from skyluc/master-on-juno-and-kepler

Juno binaries on Kepler