filterTime to differentiate
added two buttons for filterCategory, need to add logic
changed dataContainerTwo, a very bad var name, to lifeEventsInView
$scope.filterCategory = function. graph directive has category as an attr.  $watch on category.
changed name of "meal" var to categoryData, changed css name too, clearer names
colorScale based on d.category.  i don't like the colors bc they're too similar
added null option for categories on controller, updated path2 in directive to fit category choice,
circle colors correctly update based on category
added transitions for both path and path2 and circles
pulldown menu for category for addEvent
category goes to null after you input something
Merge branch 'd3filtercategory'