Merge pull request #6 from r3wt/master

Introducing modern password hashing to UserFrosting.
Update README
backwards-compatibility with md5

Automatically updates older, md5-hashed passwords to the new encryption
standard when users log in successfully.
Merge pull request #7 from r3wt/master

Update csrf token function, provide support for those without openssl
Merge branch 'pr/7'
Merge pull request #1 from alexweissman/master

fetch head of latest commit