Added registration link
fix spacing
Update dates in Workshop Info to next dates in Octtober, 2013
Merge pull request #97 from PeterDP/master

Update dates in Workshop Info to next dates in October, 2013
Formatting of commands & output, some rewording.
Add links and basic instructions for VirtualBox and Vagrant.
Reformat VM output, add section on stopping and starting.
Update ssh command output with samples from OpenSSH for Windows
Add instructions for installing and using GitHub for Windows and Git Shell.
draft of Pre-workshop downloads
typos
use direct links
add git download to install git bash console on windows
Add 'text' modifier to code blocks.

Update Download instructions to match pre_workshop instructions.
Remove TBD sections.
Fix typos.
Install GitHub for Windows instead of Git for Windows.

Students using the VM don't need Git for Windows.
GitHub for Windows supplies the ssh command needed to access the VM ("vagrant ssh").
Update sponsor logos for October 2013

* Add SI logo
* Alphabetize image links
Bring back June 2013-specific sponsors list for recap
Don't link these hypothetical URLs
Credits link from curriculum is outdated
Replace survey link with link to new survey