OO-272 OO-371 svg loader with alpha transparency (thanks stephan clemenz), use modernizr to detect browser features to better support IE7/8

non-jira: fixed some utility methods using unsafe waitForPageToLoad method and added FunctionalCourseUtil field to FunctionalRepositorySiteUtil.

OO-372,OO-96: implements mappers which can be persisted on the database, implements the infrastructure, implements the scorm mapper and the file mapper for iframe to be serializable/deserializable,

non-jira, OO-348: Updated tests to use instantiated site utility classes from FunctionalUtil. Fixed unsafe method clickRadio in FunctionalUtil.java.  Implementing checkCreateSubcategory test therefore I have written createCatalogSelector and createCatalogSubcategory method.

OO-373: made the notifications manager robust under concurrent access, write more unit tests to tests the queries on the database and test it under concurrent load

OO-293: better back support while switching between static sites and enhance the check for the mapping site <-> history point by adding a real business path

OO-293: better back support in course (run), better switch between sites and dynamic tabs, better behavior after closing a tab (stack of previous tabs/sites not limited to 1 site)

OO-291: add english translations, replace tutor wording by coach, in course membership switch to the "All" tab after adding a member, in the list of memberships disable the checkbox for waiting list if not available

OMA-87: enhance the REST API for notifications, add more informations about forum and folder notifications