AUI-1646 Add and remove row from layout
AUI-1646 Add and remove col from a row
AUI-1646 Change bootstrap class from md to sm
AUI-1646 Improve events management
AUI-1646 Allow col to be created with a regular javascript object
AUI-1646 Attach events when set a new layout
AUI-1646 Remove Content module
AUI-1646 Allow col resizing when mouseup happens outside the container
AUI-1646 Lock drag handle when click on it
AUI-1646 Move drag handle around when resizing the column
AUI-1646 - Source formatting