Reformat and reword the readme

@BronsonQuick horribly mangled this, so let's fix that up. :sparkle:
Add git core into our box
Fix up typos in the yaml override file names
Update wp submodule to 3.6.1
Fix typo in readme. See #5
Merge pull request #19 from om4james/readme-submodule

Readme typo
Merge pull request #18 from sennza/git-core

Add git to our box
Update to 3.7
Merge branch 'master' of github.com:sennza/WordPress-Skeleton
Update to 3.7.1
Disable Autoupdates during development
Merge pull request #22 from sennza/autoupdates

Disable Auto Updates during development
Adds sendmail props @rmccue
Merge with Master
Update WP