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

Conflicts:
	epub-modules/epub-renderer/src/readium-shared-js
Merge branch 'develop' into feature/mathjax

Conflicts:
	epub-modules/epub-renderer/src/readium-shared-js
updated dependency
loading mathjax on demand
More fixes for Firefox XML namespace handling incompatibilities in package document parser
by using getElementsByTagNameNS() instead of jQuery selectors that
behave differently on WebKit than on other engines.
Implement iframe content, script, and reading system object injection.
Merge branch 'feature/iframe_injection' into feature/mathjax

Conflicts:
	epub-modules/epub-renderer/src/readium-shared-js
sumodule
Pass mathjax url to zip iframe loader which will then pass it on to the basic iframe loader.
Update sub module.
Update sub module.
Convert all jQuery queries (that get confused by XML namespaces on Firefox) to getElementsByTagNameNS().
Update sub module.
version update script
submodule
moving epubReadingSystem versioning to feature branch
submodule
submodule
Merge branch 'develop' into feature/mathjax

Conflicts:
	epub-modules/epub-renderer/src/readium-shared-js