adds caching to normal placeholders and optimizes imports for debugtoolbar cache panel
Add ability to set X Frame Option header per page
Allows default X Frame Options value to be set in settings file.
Add caching to Page.get_xframe_options
Add cache clearing to Page model unit tests
fixed tests
Merge pull request #2477 from xray7224/XFrameOptions

Per-page X-Frame-Options/Clickjacking protection
docs
cache views
renamed migration
Merge branch 'develop' into fix-2267

Conflicts:
	cms/tests/admin.py
	cms/views.py
#2679 fix for cms3
Merge pull request #2692 from FinalAngel/develop

#2679 fix for cms3
caching for views.py
docs
And yet another missing unlocalized
do not cache pages for logged in users
tree tooltip change to be more responsive and awesome. Fixes #2678 and #2677
fix typo
fixed an issue where element is not opened on the top frame