IE support for vertical writing mode
version update script
fixed pagination issue with Firefox
checking version git commit hash
fixes #39 (WebView scale rendering clipping bug)
closes #60 (CSS clipping bug in WebView OSX)
minor commenting
minor comments
moving epubReadingSystem version to feature branch
fixes #62 (z-index stacking order due to CSS GPU hardware acceleration, which is needed to fix a blocking bug (clipped rendering) in WebView OSX in native Readium launchers)
Fixes #66, CSS column pagination empty/blank pages when body spacing (padding/border)
Additional tweak for #66, min/max diff influences columnised scrollWidth (try accessible_epub first page with bottom HR)
Should address issue #68 (center spread corrupts left/right sequences)
addresses #57
Merge branch 'develop' into feature/mathjax

Conflicts:
	js/views/reflowable_view.js
Use Blob URLs for iframe content injection.
This is now used in favor of the document.write approach because XHTML needs to be parsed and rendered properly.