pass viewport element to the reader to render into
fixed book bookbox (in progrtess)
fixed layout box
Support for book box styling in fixed layout
Support for book box styling for reflowable layout
styling page frame
shared-js dependency
Merge branch 'develop' into feature/book_box

Conflicts:
	readium-shared-js
support for styles in prefferenses dialog
reference next version shared-js
Fixing UI Styles interaction
Working on set style functionality (bugs chasing)
styling
styling positioning bug fixes
moving moving css and templates resourses to shared-js
fixing fixed layout positioning for different styles
Fixing styles order bug
added style collections
Apply styles refactored
renamed resetStyles to clearStyles
new share-js