README edits

I did a couple of README edits.

* README to 80 chars per line. 01f17e5
* consistent reference to ftw.lawgiver using ``. 39479f1
* DSL is a common acronym no need to write it out. 9b990ce
* copy edits in the README c3d63cb

I didn't squash the commits to remember what I actually changed :smiling_imp: but let me know if you want to squash them before the merge.