Backwards compatability instructions for web plugins
Fixed error in django version comparisons for Web Plugins and added section on coping with new url import statement
Restricted width to 78 characters
Syntax changes to conform to standard
Small fixes from PR #603

Conflicts:

	omero/developers/Web/EditingOmeroWeb.txt
Merge pull request #622 from will-moore/small_fixes_from_PR603_dev_5_0

Small fixes from PR #603
Merge pull request #615 from dpwrussell/rebased/dev_5_0/plugin_backwards_compat

Backwards compatability instructions for web plugins (rebased onto dev_5_0)