Implement double-click linking from JUnit runner to test suite level objects.

Suite/feature/scenario/describe/context all link correctly now.
Make Run As... with selection in a scenario header line run that scenario instead of running the wrapping feature.
Fix compile + run of open test action on Luna + Mars. Should work on Kepler+ now.
Merge pull request #151 from timw/feature/result-suite-linking

Test suite element linking from JUnit runner