[GEOT-4424] Efficient support for multiple coverages in GridCoverageReader
Merge branch 'geot-4424' of github.com:aaime/geotools into aaime-geot-4424
A few header and javadoc fixes

Signed-off-by: Jody Garnett <jody.garnett@gmail.com>
Merge branch 'master' of git://github.com/geotools/geotools