Remove unnecessary code

Merge pull request #20 from alwaysblank/11-add-array-access

Add is(Not)Empty helper methods

Minor formatting and doc changes

Although there are a lot of lines changed here, none of them affect
functionality, and only affect code layout or documentation.

Better internal value handling WIP

Fix major error with map(), transform()

Essentially these did not allow for correct behavior. They now do.

Add map() and transform() with tests

Add way to create non-exemtive empty Brief

Process aliases when storing content

Add allow setting values through aliases