Fix a build error using JDK7

A build error using JDK7 was uncovered by unit testing in module unsupported/coverage-experiment/netcdf. The fix is applied in module unsupported/coverage-experiment/unidata. The fix is to use an explicit Comparator for a TreeSet.
Throw ClassCastException when comparing incompatible ranges types
[GEOT-4523] dpi rescaling won't work on graphics that do not have a size
Merge pull request #237 from brett-walker/fix-unidata-jdk7

Fix a build error using JDK7
[MD]: Setting greater wait time on harvesting test to allow index date change being recognized
relax ColorModel checks
Merge pull request #242 from geosolutions-it/upm

GEOT-4524, relax ColorModel checks
fixing compile error due to shapefile store api change
[GEOT-4526] Burnes surface comes out with a band name that's not usable as a feature attribute
[GEOT-4527] Number format filter function is not null safe
[GEOT-4533] Have H2 store create auto mixed mode connections for embedded usage
Allow the image mosaic to parse custom time formats
Minor improvement on unidata variables adapter features initialization
Make format work with the new indexer.xml syntax
Create a Pull Request Policy
Add missing image.
messed with headings and added additional images

Signed-off-by: Jody Garnett <jody.garnett@gmail.com>
Remove warning messages generated by Maven 3.
Correct minor formatting issues.
Merge pull request #247 from brett-walker/remove-build-warnings

Remove warning messages generated by Maven 3.