Add instructions for saving as a Bower dependency

For people who are new to using Bower, or are just plain forgetful, I
want to have an easy-to-reference set of instructions that will get
people up and running as quickly as possible.

Change-Id: I7d5ab02864e46c3e1696b740b512b7ed3d5f68d7
Reviewed-on: https://gerrit.causes.com/31483
Reviewed-by: Joe Lencioni <joe.lencioni@causes.com>
Tested-by: Joe Lencioni <joe.lencioni@causes.com>