Increased version on 'develop'
EPUB-217: Removed automatic synchronization of the frame origins.
EPUB-217: Removed automatic refresh of the markers and the drawing. Added function for manual refresh.
EPUB-217: removed contextOriginGetter option. The context origin properties may be provided while refreshing a selection
EPUB-217: Prevented operating on the range of an outdated document
EPUB-217: Extracted function 'refreshSelection'
Merged in EPUB-217

Added 'refreshCustomSelection' function, minor bugfixes
Dist of version 0.4.0
Updated readme.
Release 0.4.0

Changes:
 - removed the scale getter
 - removed magic calculation of iframe origin offset.
 - added possibility to manually provide selection origin offset and scale
 - added function allowing explicit refresh of the selection with different context origin
 - updated demo