Added Controls For The Copyright Year To user.json And System For Updating user.json

Hi Remy,

Sorry, I would have liked to make this 2 pull requests, but I don't know how.

First Pull Request:
I added the ability to set the years for the copyright in your user file, see the new README.md for more docs.

Also, I added some stuff to .htaccess and index.php to make it able to run on localhost.

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Second Pull Request:

Now Users Can Update their user.json without a pull request!
Simply:

*When You First Use `curl -d'<user.json>' <mysubdomain>.mit-license.org`, make sure you put a `password` property (this is now required).
*when you want to update your entry, run the same curl command, but with new data, remember to put in the same password.
*If you have the correct password, your user.json will be updated and pushed to github.
*your password is automatically hashed.

If you have already uploaded a user.json, just upload a user.json with one.

If for some reason someone needs to add a user via a pull request after merging this one, just hash their plain-text password with sha512.

Thanks
Ari