Update assignment agreement instructions and add a CONTRIBUTING.md file for GitHub
Addig a profile to include colormap extension in the build
[GEOS-6372]: Support CoverageBandDetails customization: name, null values, range
Merge pull request #507 from dromagnoli/GEOS-6372

[GEOS-6372]: Support CoverageBandDetails customization: name, null value...
Fix markdown errors using github preview
Merge pull request #1 from jodygarnett/patch-1

Fix markdown errors using github preview
Merge pull request #532 from jodygarnett/contributing

Add CONTRIBUTING.md based on dev guide (GEOS-6389)