Corrections in grammar/spelling/ambiguities in docs.

Hey Shoppers,

Been reading through the docs as I dig in earnestly through the source code to start writing some batman.js plugins, and thought the docs could use a little grammatical love =)

It's just a cursory read through, but I fixed a handful of mispeligs, typos, ambiguities in wording/fragments, etc. and did my best to follow the implicit conventions. I've done some basic Batman.js dev so hopefully the ambiguities have been *correctly* resolved.

As I continue dev I'd love to help contribute to the framework -- maybe docs is one way I can be of use.

~ Jonathan Martin