Merge pull request #31 from oerpub/phil-styling

Restyle the workspace and sidebar
Replace the pencil icon with mockup-supplied png.
Show friendly name for content

So when you hover over the pencil icon, it tells you whether it is a book or a
module.
Show the pencil icons on the workspace side.
Turn edit pencil into a dropdown, allow user also to edit.
Enable bootstrap tooltips on menu items.
Merge branch 'pencil-from-mockup' into testing