Minor changes for convenience
Column bug fix (Would add col-md-1 and col-md-12 for MD_12)
Added ability to change the size of the columns all together instead of just adding size. Cascaded this ability to the other ColumnPush/Pull/Offset too.
Adding in support for Tooltips and putting them into the Demo, also removing some unused demo code.
Adding in support for Popovers and putting them into the Demo
Handle events in Tooltip/Popover
Making column support comma and space separated list
Added license headers
Merge remote-tracking branch 'remotes/jgodi/master'

Conflicts:
	gwtbootstrap3-demo/src/main/java/com/svenjacobs/gwtbootstrap3/demo/client/demos/javascript/Tooltips.java
	gwtbootstrap3/src/main/java/com/svenjacobs/gwtbootstrap3/client/shared/event/HiddenEvent.java
	gwtbootstrap3/src/main/java/com/svenjacobs/gwtbootstrap3/client/shared/event/HiddenHandler.java
	gwtbootstrap3/src/main/java/com/svenjacobs/gwtbootstrap3/client/shared/event/ShownEvent.java
	gwtbootstrap3/src/main/java/com/svenjacobs/gwtbootstrap3/client/shared/event/ShownHandler.java
	gwtbootstrap3/src/main/java/com/svenjacobs/gwtbootstrap3/client/ui/Column.java
	gwtbootstrap3/src/main/java/com/svenjacobs/gwtbootstrap3/client/ui/HasHover.java
	gwtbootstrap3/src/main/java/com/svenjacobs/gwtbootstrap3/client/ui/Popover.java
	gwtbootstrap3/src/main/java/com/svenjacobs/gwtbootstrap3/client/ui/Tooltip.java
	gwtbootstrap3/src/main/java/com/svenjacobs/gwtbootstrap3/client/ui/constants/Placement.java