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)
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)