[GEOS-6222] Build failure in gt-app-schema-test caused by change for [GEOT-4634] MetaBufferEstimator won't give the right response if a Mark is used, but its size is not specified
GEOS-6152: fixed links in documentation pointing to gridlock site
Merge pull request #425 from mbarto/24x_fix_nightly_links

GEOS-6152: fixed links in documentation pointing to gridlock site
[GEOS-6215] workspace styles can only use images/graphics from global workspace
[GEOS-6201] Missing abstract definition of layer group in gwc integration
GEOS-6170, updating GeorectifyProcess to work without ant (and adding a test in the process).

- Using java ProcessBuilder api to call out to gdal