Added Colors as per categories to Sessions
	modified:   bcb14.json
	modified:   bcb_app/res/drawable/session_list_item_title_background_drawable.xml
	modified:   bcb_app/res/layout/session_list_item.xml
	modified:   bcb_app/src/com/bangalore/barcamp/DataProcessingUtils.java
	modified:   bcb_app/src/com/bangalore/barcamp/SlotItemsListAdapter.java
	modified:   bcb_app/src/com/bangalore/barcamp/data/Session.java