Helper updates

I added a markdown document for most of the helpers. It's a work in progress for sure.
I added fluency to some of the helpers and updated the tests.
I fixed the ordering of the styles helper to match that of the scripts helper. It was sorting via the tag first, then position. I think it should sort via the position, and then by the order it was added to the array. Would you agree?

I also fixed a 'bool' in the checkboxes and radios helper for the 'checked' parameter. 

I probably should have had a single pr for some of these commits. I hope this one is ok. Also, I fixed my develop branch so it should work properly with the auraphp:develop branch.