bumps version to 3.0b4.dev4
finally found the mptt fucker in copy plugins
Merge pull request #1 from divio/develop

updating fork from master
fix for setting inheritance on a page
temp reverting #2606 change as it is blowing up
Fixed tests to support specifying user model on the command line, and custom models that do not have a username field, or use email as username field
Merged upstream changes
removing the spaceless tags as it mucks with html output
Merge pull request #2 from daegun/removeSpaceless

removing the spaceless tags as it mucks with html output
Minor docstring change
fixes #2613
fixed reversion tests
Merge branch 'develop' into fix-2583
reverted some of the new ordering logic
Merge pull request #2617 from digi604/fix-2613

fixes #2613 (plugin edit marks page as dirty again)
Merge pull request #2595 from digi604/fix-2583

Fix 2583
bumps version to 3.0b4.dev5
Added a check when trying to set application urls and namespace in post_save_page signal.
Merge branch 'develop' into ticket_1916_develop_merge
validation for plugins. added more docs for child plugins