Readme and other tweaks

Hi there!

Since we included this in the Symfony docs, I thought it needed a proper README so that people could use it easily (afterall, the goal is to *ease* development). I also tweaked a few coding standards, etc.

Also, after this is merged, we'll need to create another tag - I noticed that (at the very least) the README is missing from the latest tag, and regardless, having the new full README in the latest tag will be a good thing.

Btw, the bundle worked nicely for me :).

Cheers!