Fixing WMS GetCapabilities(). 

The WMS GetCapabilities() request was failing for a clean EOxServer install with no coverage or collection installed.
Fixing issues with GetEOCoverageSet. Should now work.
Fixing GetEOCoverageSetHandler.
Fixing the broken masked WMS layer factory.
Fixing the broken masked outline WMS layer factory.
Minor refactoring the colorized mask WMS layer factory.
Fixing subset handling by moving WCS 2.0 specific stuff the appropriate locations.
Merge branch 'master' of git+ssh://github.com/EOxServer/eoxserver
Fixing coverage WMS layer factory inheritance and double imports of the components.
Merge branch 'master' of github.com:EOxServer/eoxserver
Small fix in WMS 1.3 exceptionhandler causing an error in rare cases when the exception code is set to None.
Implementation of a limited ISO 8601 date/datetime parser.
WCS 2.0 subset decoders now use the new timestamp parsers.
Correcting WMS time subsets.
Merge branch 'master' of git+ssh://github.com/EOxServer/eoxserver
Fixing import issue
Travis CI integration tryout.
Travis CI integration tryout.
Merge branch 'master' of git+ssh://github.com/EOxServer/eoxserver
Update .travis.yml

trigger travis run for testing  purposes