Merge pull request #14 from swenson/master

GitHub API talk for 2013-03-27 proposal.
Add some intructions for contributing
Update README.md
Add a proposed new PDX Git logo from @BartMassey
Add a sponsor logo for Elemental
Fix typo in @swenson's talk proposal
Merge pull request #16 from swenson/patch-1

Fix typo in @swenson's talk proposal
made minor formatting changes to the proposed pdxgit logo
added pdxgit-simantel-green logos
Add the skeleton of a sponsors page
Add elemental to the sponsors page, #15
Add some text, links and a leto labs logo to the sponsor page
Add puppet logo and add it to the sponsors page
Live demo!

To show off Github Pages
Update README.md
Remove last month's upcoming talk. Add slides