Use `Import-Package` instead of `Require-Bundle` for org.eclipse.core.runtime.

This should allow Luna installs without conflicts due to “double vision” of
the `javax.bind.ws` package. This workaround was suggested in this Eclipse ticket.

https://bugs.eclipse.org/bugs/show_bug.cgi?id=430458
Update pref store reference in `ScalaSourceViewerConfiguration`
Update pref store references in scanner classes

There was no need to use multiple pref stores, only one is used now.
Replace references to Java partitions with references to Scala partitions

This shouldn't introduce any functional changes beside from the point
that everything related to partitioning (syntax highlighting, auto
edits) have a chance to not work anymore.

Some new Scala partitions are added, they replace partitions located in
`IJavaPartitions` and `IDocument`.

Because this is a no compile-time-save change, it could be that some
references are forgotten, but hopefully my grep-foo caught them all.
Enable Scala partitioning on all Scala files

After all referenes to Java partitions were removed, syntax highlighting
didn't work anymore because the `IDocumentSetupParticipant`, that
intrnally uses Java partitions was inherited from the Java plugin - a
problem which is solved by this commit.
Add new Scala partition to constructor call of `JavaHeuristicScanner`

The previously called constructor forwards to another constructor by
passing Java partition references, which obviously are not the right ones.
Use UTF-8 for tests.
Update build-all script to kepler.
Merge pull request #742 from sschaef/remove-java-partitions

Remove java partitions
Revert "Merge pull request #742 from sschaef/remove-java-partitions"

This reverts commit e69c738c68034deb8a9e64f667240ac4f0229609, reversing
changes made to f9098ee6cb35a6f5dcd3dc917205d359c1fb1d8d.
Merge pull request #753 from huitseeker/revert-742

Revert "Merge pull request #742 from sschaef/remove-java-partitions"
Merge pull request #751 from dragos/issue/resolution-order-luna

Use `Import-Package` instead of `Require-Bundle` for org.eclipse.core.runtime