Update comment on how to get access token credentials
Merge pull request #3 from sachu/master

Update comment on how to get access token credentials in twitterstream.py
Reduced dna.json and made matrix.json sparse
Reduced order records.json
restructure directory and tweaked asymmetric friendships
Massively reduced books.json
Renaming order_records.json to records.json
renaming asymmetric_friendships.json to friends.json
Removing skeleton code
Fixed books and dna data, added wordcount.py and tweaks to MapReduce
Interface tweaks to mapreduce framework and wordcount example
Adding solutions
Merge git://github.com/uwescience/datasci_course_materials