Feature: merging Bill View into master branch

Merging Bill View feature into master branch. It is a working Minimum Viable Product.

Details to address:
  * Bill View will ultimately be triggered from a legislator view. Search functionality will need to be phased out.
  * Should word frequency in the bill be a part of the Bill View? (The wordGraph() feature is being merged in but can be removed if this feature isn't deployed.)
  * All annotations are from a single account on AnnotateIt. We can fix this as a stretch goal, but it is currently acceptable as a proof-of-concept.