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
First draft of glossary