Adding print statements for debugging (logging isn't in master yet) and fleshing out SA_* scripts to debug EMR job failures.
Fixed SA_Mapper.py so it works on EMR.
Fleshed out SA_Worker.py and broke out code into different functions.
Added a sa_reducer.py script. It's an indentity script + it does some formatting.
Parameterized the tweet_batch query string and increased the default batch size.