Merge pull request #494 from sbesson/rebased/develop/spring_redirect

Define Spring hyperlink and extlink for Spring doc in OMERO conf.py (rebased onto develop)
Merge pull request #493 from sbesson/rebased/develop/webmobile_link

Fix broken webmobile repository URL (rebased onto develop)
Rescaling images in script docs
merge develop -D org -I include -E exclude: PR 450 (omero: Python 2.6 is the minimum supported version)
merge develop -D org -I include -E exclude: PR 498 (Script docs image rescaling (rebased onto develop))