Made few hotkeys.

Made few hotkeys corresponding to suggested workflow.
P : Publish "octopress" project. (.org -> _posts/.html)
D : Deploy (_posts/.html -> public/blog/.html)
C : Commit all changes.

For deploy, I copied commands suggested in Octopress official page. (http://octopress.org/docs/deploying/)
Whether or not to include "git push" in C hotkey => Official page's suggested command contains push, and I followed it (http://octopress.org/docs/deploying/github/) 
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Don't forget to commit the source for your blog.
git add .
git commit -m 'your message'
git push origin source 
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