Adding API doc links to OMERO docs front page
ticket 10030 fix - contributing file for docs repo
Proper bullet point formatting
Delegate all Makefile targets to ant

Embed and use ant-contrib so that it's possible to build on systems
without ant-contrib on the default classpath.
ant: Use ant-contrib jar directly
Merge pull request #761 from rleigh-dundee/ant-makewrap

Delegate all Makefile targets to ant
Merge pull request #759 from hflynn/rebased/develop/contributing-file

ticket 10030 fix - contributing file for docs repo (rebased onto develop)
ant: Default all properties and handle empty vars in conf.py
Merge pull request #758 from hflynn/rebased/develop/api-links

Adding API doc links to OMERO docs front page (rebased onto develop)
ant: Correct property defaults
Merge pull request #766 from rleigh-dundee/ant-propertydefaults

ant: Default all properties and handle empty vars in conf.py