add hangouts handler

@mdimas @vijaykramesh @erikogan @mrubens @orfah 

How does this look for a first-pass at a simple lita handler to create a new google hangout link on-demand?

I have it running in staging mode in the "Lita" chat room right now.

I made it so you can write either one of these:
`hangouts`
`hangout`
`new hangouts`
`new hangout`
to create a new google hangout and each new room is simply created with a UTC timestamp.