Merge pull request #12 from declassengine/ExecOrderGrep

Code for Creating tables of executive order info from DDRS
added sql code that generated the tables for my analysis
added script to split documents pairs into two kinds of files: 1. text that has ever been redacted 2. text that has never been redacted.  text files are indexed by pair id
added get_body to cable_helpers
added function to process text files in R allowing for stemming
add blur filters
Merge branch 'master' of https://github.com/declassengine/declass into redactometer