fixes bug with improper model saving events

Promise.all was improperly used as an instance
method after bind. Moves .bind to after when.all
to fix potential race conditions during save event
promises.
updating docs for 0.6.1
release 0.6.1
Removing unnecessary UMD

When this eventually enabled on the client side,
we can build this into the build script.
Merge branch 'master' of https://github.com/tgriesser/bookshelf
Resolving conflicts