Update 2013-07-19 meetup notes & repo README.md

Includes workaround:
Rearrange content in 2013-07-19 meetup notes (workaround)
Update CSS styles for embedded Gists to avoid ugliness
Merge pull request #7 from mbbx6spp/update-2013-07-19-meetup-notes

Update 2013-07-19 meetup notes & README.md