0.5.1

Changes:

• The whole code base rewritten to the object-oriented architecture using CoffeeScript
• Added object-oriented API as an alternative for jQuery plugin
• Fixed wrong selection drawing when the end of selection range has been put at the beginning of an element [Bugfix]
• default CSS class for the start marker changed from jcs-beginning-marker to jcs-start-marker
• renamed the configuration option for a content origin transformation from contextOrigin to contentOrigin