Merge pull request #9 from binaryberry/master

resolving rebase issues
Merge pull request #10 from binaryberry/master

refactored Geojson layer action in slider part of layout
Refactors the Event helper methods into smaller methods and moves them out into a module.
refactors the refactoring as it wasn't quite there the first time.
Further refactoring. Changes the event handler for the slider to be on value change rather than slide, and wipes the map before each AJAX call
added input form for uploading events. NB: end date not a required field