Update README.md

Added section on how to contribute and a link to the Fly Vim, First Class blog post introducing Maximum Awesome.
Run the vim we installed when setting up Vundle.

This should allow us to at least complete the first run for someone who doesn't have ~/bin in their PATH. Closes #119.
Merge pull request #123 from square/run-vim-directly-for-vundle

Run the vim we installed when setting up Vundle.
Merge pull request #121 from eshilts/patch-1

Update README.md
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Merge branch 'master' into mine