Fixed issue with default date filter.

• Changed Event Participants Field Output Handler to return a string.
• Build a cache clear when a data processor configuration is changed.

Performance improvement by caching the data processor and the api calls.

• Added error handling to importer
• Added sort in Manage data processor screen

Fixed issue with activity search and actions after the search when the actions are run on all records.

Fixed issue with date filter

Fixed #11

Initial release