Feature/timeline crud

Implemented adding new events to the timeline.

Some UI thinkg are still missing, like disabling "addEvent" button before dataSet is loaded etc.

First I would like to modularize everything: separate eventLoadingForm, newEventForm or something like this.

Please don't merge until not finished by me :P
instead of passing formId we could add some class to forms which we want to handle here and then build selector like this: 
$('form .js-our-form').on('submit', function(e) { ... }); 
I prefer $(xxx).on('xx', function(){}); methods instead of click(function(){}), submit(function(){}); etc. when we see ON we exactly know that is some handler and it is harder to omit that while reading code