Implement storage of sources and episodes width Indexed Database API
Refactor Interface for Storage Engine (POD.storage). The selection of the used storage Engine is now transfered to special functions.
Add custom events 'WriteEpisode' and 'WriteSource' that fires after writing a episode or source to storage; Change parseSource: this Function saves the source and its episodes automatic to database.
cleanup code a litle bit
Polyfill custom event constructor for Internet Explorer