re-worked mapping to map more foia.gov/data to foia_hub

I decided to split 18F/foia/pull/81 into two pieces. Part one re-works some of the details of the mapping from foia.gov/data to foia hub. Below are examples of some of the mapping issues I encountered. In all, about 160 of the names between foia.gov/data and foia_hub don't match. Much of this mapping was completed manually in order to ensure accuracy. 
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**spelling errors**
National Cemetary Administration ---> National Cemetery Administration  
Bureau of Alcohol, Tobacco, Firearms, and Explosives ---> Bureau of Alcohal, Tobacco, Firearms and Explosives

**& vs and both ways**
Office for Civil Rights and Civil Liberties ---> Office of Civil Rights & Civil Liberties
Veterans' Employment & Training Service ---> Veterans' Employment and Training Service

**multiple mappings**
Savannah River Office --> Savannah River Office AND Savannah River Operations Office
Office of Information and Technology --->  Office of Information & Technology AND Office of Information and Technology (005) AND Office of Information and Technology

**additions**
Office of the Assistant Secretary for Operations, Security, and Preparedness ---> Office of Operations, Security, and Preparedness (formerly S&LE - Security & Law Enforcement)
Office of Special Counsel ---> U.S. Office of Special Counsel

**omissions and number changes**
Region V (Chicago, Columbus, Cleveland, Detroit, Indianapolis, Milwaukee, Minneapolis-St. Paul) ---> Region 5 - Chicago