Revising (shortening) Git intro for novices
Starting work on glossary
renamed expanded funcitonsandmodules, removed duplicated files
Corrected name
Added hint illustrating modulo operator
Changed order of exercise, coersion paragraph
Moving assertions and unit testing to intermediate; not sure what to teach about defensive programming here
Material on QA from novice for recycling
Re-introducing unit testing
Adding link back in instructions
Added pandas slides
Added exercises to Pandas notebook
Added solutions to pandas notebook
Added pandas slides
shell-filedir notebook directory reorganization

* removed redundant instructor notebook
* renamed shell-overview more appropriately to shell-filedir
Suggested revisions to PR #93

Very minor editing and fixes
Example files for intro to shell
Merge branch 'gh-pages'
Merge branch 'master' into new-shell-beginner-lessons
Fixing headers and image links