Small stylistic cleanup for data_formatters.

Issues #5, #6, and #8 fixed. All small stylistic changes to get data_formatters to conform to Google's JavaScript Style Guidelines as mandated in this project's README. This is in response to the rejection of pull request #7.

Although my committing behavior was a little messy (won't happen again), a code review would be lovely.

That being said, there is still a little inconsistency with regards to newlines and if statements, namely
> if {
> ...
> } else {
> ...
> }

or 

> if
> {
> ...
> }
> else
> {
> ...
> }


Google's guidelines appear to be slient on this issue so I suggest it should not hold up the pull request. Although, I would be happy to go one direction or another if we want to insist on that conformity.