Merge pull request #116 from Aryan-Barbarian/master

Making Git Collection More Presentable
editing Interaction Graph notebook to use a broader array of notebooks
adding explanatory text to Show Interaction Graph
cleaning up Auditing Fernando notebook, using new notation/tools
Merge branch 'master' of github.com:sbenthall/bigbang
some cleanup to the Plot Activity and Cohort Visualization notebooks
Right before branching for metrics
Merge remote-tracking branch 'upstream/master'

merging w upstream
Simple upload of notebooks without entity resolution. This will not run because it does not have entity resolution yet.
Added Aryan's version of entity resolution