JBIDE-17656 Remove unnecessary System.gc call.

This ensures that GC is not hinted to the JVM when setting file
contents. It is necessary only when attempting to close file
handles after a deletion.

Also fixed a resource leak issue.
Merge pull request #497 from VineetReynolds/JBIDE-17656

JBIDE-17656 Remove unnecessary System.gc call.
FORGE-1989: HibernateDialect doesn't add the descriptive text anymore on non-GUI enviroments
FORGE-1989: Merging same dialect class in a single description
[maven-release-plugin] prepare release 2.8.1.Final
[maven-release-plugin] prepare for next development iteration
FORGE-1990: Saving connection password