Merge pull request #28 from jennybc/master

Jenny finished notes on Functions
Merge pull request #29 from jennybc/master

A start on Jenny's notes re Environments
Update README.md
some quick notes from today's discussion
Andrew's (incomplete) notes on Environments
Kim's HTML (for completeness)
edits to Andrews functions
for some reason Alathea's html is slightly different?
discussion notes markdown rich's gist added
Merge pull request #4 from aammd/master

Get changes from upstream