Cross-browser navigation logic for reflowable view
RTL-related adjustment of geometry-based algorithms
Repositioning (trimming) rectangle by Y offset
Injecting the methods introduced by daniel.weck
Unifying visibility check (always returns a visibility percentage)
Merge develop branch, minor fixes
Merge branch 'develop' into feature/pagination
Fixes for last page's element visibility check
pageOffset initialization fix
Fixed adjustment of the trimmed rect, positioning of the first RTL column in Firefox, defensive pageIndexing.
minor update to module.json
Merge pull request #16 from irls/feature/pagination2

Cross-browser navigation logic for reflowable view
Merge readium/develop commit 'fc97451f1a11d52eb18fa317c8fdafe77a2343ed' into txtr_dev