Bower style compliance

Track unminified version using bower.

Put license into unminified version. Change gruntfile accordingly.

We use @license which is understood by closure compiler as a to-be-kept
comment.

Release v2.0.4

Fixes #39 #40
Precise main script maybe solves testling issues
Merge branch 'master' of github.com:vvo/lazyload

Conflicts:
	package.json