Removed unused imports
MODE-1755 Exposed the 'getPlan():String' method on ModeShape's QueryResult public API
MODE-1750 Ignored two of the TCK tests due to errors in the tests.

Corrected the link to the JCR project's JIRA in the POM file.
See MODE-1758 for more detail on the tests and their errors.
MODE-1755 Implemented 'getPlan' in other implementation classes