Merge pull request #6 from khandelwal/master

Table of Contents changes, and other external links. Some re-organization of code.
Pull over tests for internal citations
Merge branch 'master' of git://github.com/eregs/regulations-parser into HEAD
Move over terms 'grammar'
Pull over Interpretation citations
Move code into parser module. Make layer sub module
Copy over the tree-generating code, along with tests
Copy over a few more tests
Move over terms 'grammar'
Merge branch 'updates'
== None -> is None
appendicies -> appendices... spell check fail
Follow PEP8 more closed with regards to spacing between functions/methods
More appendices misspellings
Merge pull request #7 from cmc333333/master

Merge in Grammars, Tree-Parsing, and move code into parsing package
Getting the external parser to work for Public Law citations
Merge branch 'master' of https://github.com/eregs/regulations-parser
Added a TERMS file