support for dip links in progress
fixing internal links navigation
exposing iframe events subscription api
fixed bug on missing function for fixed layout
Merge branch 'develop' into feature/deep_link_cfi_resolve

Conflicts:
	js/views/fixed_view.js
restorred addIFrameListener function
Merge commit 'b75f51928170178b7faccc66edf1f5d1c2b7daa1' of readium/develop into txtr_dev