Update text plugin information
Trailing whitespaces
Mac OSX installation instructions
Fixing installation doc (Brew instead of Macports)...
Adding some more information about virtualenv
Merge existing work from pull request #2438 from oscarmlage/oscarmlage/doc_fixes

oscarmlage/doc_fixes

Conflicts:
	docs/getting_started/installation.rst
	docs/getting_started/plugin_reference.rst
docs: fixed internal ref
Merge pull request #2673 from Chive/fix/doc-fixes

Docs: Mac OSX Instructions & Virtualenv
Fixed Manual Toolbar Registration (was broken) + docs
Merge pull request #2682 from Chive/fix/manual-toolbar-registration

Fixed Manual Toolbar Registration (was broken) + docs
docs: added example for unihandecode.js usage
Merge pull request #2683 from Chive/fix/improve-unihandecode-settings

Added example docs for unihandecode.js usage
Fixes #2688
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
Merge pull request #2689 from jrief/fix-issue-2688

Fixes #2688
Merge pull request #2477 from xray7224/XFrameOptions

Per-page X-Frame-Options/Clickjacking protection
renamed migration