Merge content form three sessions at 2013-06-wise in Boston

This is an attempt to merge the new content (with history) that was written for the 2013-06-wise-beginning, 2013-06-wise-advanced, and 2013-06-wise-intermediate bootcamps in Boston (by merging these three branches together, and then merging master back in, and restoring files that were clobbered along the way).  The new content was in the form of new lessons that approached the same material.  These include shell/shell-bonus (Adina Howe) , python/testing/wise (Aleksandra Pawlik)   and version-control/git/wise (two versions, by Sarah Supp and Aleksandra Pawlik, with some older powerpoint presentations) and some lecture notes on sql (Sarah Supp).