User registration

Register form
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![image](https://f.cloud.github.com/assets/2112932/918302/89effd20-feb2-11e2-8a40-ac7050ebeb68.png)


Login form
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![image](https://f.cloud.github.com/assets/2112932/918299/714b7d94-feb2-11e2-8cb1-cba31de5d55e.png)