Doc running App from anywhere & CreateApp refactor

Conflicts:

	omero/developers/Web/CreateApp.txt

Conflicts:

	omero/developers/Web/CreateApp.txt
Add app settings to docs from PR #1788
Add warning for import changes in upgraded Apps
Removing Django 1.6-releated comments from previous commits
Small fixes from PR #603
Merge pull request #603 from will-moore/web_app_docs_11730_dev_4_4

Doc running App from anywhere & CreateApp refactor dev_4_4