Added interface for WCS 2.0 GetCoverage Encoding Extensions. Added implementation draft for GeoTIFF extension.
Allowed addition of encoding parameters for getcoverage params.
Fixed typo.
Fixed typo.
Adding documentation for decoder utils.
Using XML decoder.
Added geotiff encoding into GDAL and mapserver renderer.
Added geotiff encoding into GDAL and mapserver renderer.
Merge branch 'master' into gtiff

Conflicts:
	eoxserver/services/gdal/wcs/referenceable_dataset_renderer.py
Fixing bug in 'value_range' object.
Ensuring that mapserver gets strings and never unicode.
Preliminary 'mimetype options'.
A lot of additional checks. Fixing typo. Adding locators to XML values.
More robust exception handling.
Updated autotest with new tests.
Support for older WCS versions.
Fix for when no format is specified ('native format').
Bugfix for referenceable dataset rendering.
Updated autotest.
Preliminary implementation of the interpolation extension.