Merge pull request #15 from Gimperion/master

updated tar commands to to unzip files
merge Arun's gads7 through lesson 8
all gads7 refs in
standard open/close structure
add BigConf
sketch of doing and evaluating cross-val
add vincent mapping link
more descriptive name
add logistic rubric
split linear bit to assignment
all GA decks in
add Ng video
add second Few Useful Things
add top ten paper
add Bottou reading on SGD...
add links to data_sources document
Merge pull request #18 from justmarkham/master

added some links to the list of data sources
yet more projects! thanks @justmarkham
better filenames
Merge branch 'master' of github.com:ajschumacher/gadsdc