Scripts to create csv and json legislator bulk files

in response to issue #56

json script is straightforward (and easily adaptable to other yamls), example of json data:
https://gist.github.com/bchartoff/b7c413d7daa19174a817

csv script much more tightly linked to data structure. Initial commit includes more fields than may be useful/ neccessary (basic biographical, most ID crosswalks, social media ids, and most recent term data). Sample rows from legislators-current.csv found:
https://docs.google.com/spreadsheet/ccc?key=0AsKE2_Le6_OcdGxnRzMtZXptdldBclpDVE1ocmVJV1E&usp=sharing

Historical csv also includes social media fields. Mostly (but not completely) empty. Elimination of these fields (or others e.g. address, phone, fax) in the historical csv, or combination of both csv's into a single file is worth discussion.