mathjax iframe injection
Merge branch 'develop' into feature/mathjax

Conflicts:
	js/views/reader_view.js
Merge branch 'develop' into feature/mathjax

Conflicts:
	js/views/reader_view.js
added mathjax call
loading mathjax on demand
Merge pull request #30 from ravn-no/develop

Made removeHighlight work in IE. elem.remove() was experimental DOM API
Merge pull request #31 from ravn-no/develop

Added missing getElementByCfi() to ReadiumSDK.Views.ScrollView
robustify code against null paginationInfo + adjusted edge-case for RTL flow rectangle detection method
restore reading position when resize (upper left corner, so approximate)
fix / workaround for  WebKit / Chromium regression bug with CSS columns and vertical writing mode + Right To Left page progression direction
typo for page lookup
fixed column pagination resize
minor: arithmetic test for column width
reflow trigger for column visiblity check (e.g. direct TOC link into column index page)
Implement iframe content, script, and reading system object injection.
Merge branch 'feature/iframe_injection' into feature/mathjax

Conflicts:
	js/views/reader_view.js
IE support for vertical writing mode
Pass mathjax url to iframe loader.
Inject mathjax script
Disable old mathjax injector function for now.