Another batch of fixes

This fixes problems in the latest Eclipse (4.3 Kepler) as well as latest JBDS (7.0.0).

The exception is no longer thrown when trying to debug rules.
Using classes from kie-api does not produce warning about discouraged access.
Removed spaces after colons (makes test development easier).

Please merge this pull request into 6.0.x branch as well, thank you!