Add information about installation via Bower
Add information about installation via Bower

The documentation was not updated after #22 was closed with added Bower
support. This commit fixes this.

penne12/chrono,jpenna/chrono,adjohnson916/chrono,wanasit/chrono,penne12/chrono,adjohnson916/chrono,ToshMeston/chrono,jpenna/chrono,wanasit/chrono,ToshMeston/chrono