More realistic example heap size settings.

The example settings also follow the good practice of setting initial
and maximum size to the same value.
Docs: use GraphDatabaseSettings to configure DB.
Merge pull request #1767 from jotomo/gds-conf-docs

Docs: use GraphDatabaseSettings to configure DB.
Update copyright for 2014 (happy new year!)
Merge pull request #1775 from cleishm/happy-new-year

Update copyright for 2014 (happy new year!)