Secure user inputs.

[gwae]

Just try to generate a certificate named reboot ;- ) It can lead to serious problems, like the stealing of the certificates of other users, and so much more...

All the inputs must be escaped !

@ https://github.com/dimastopel/certdepot/blob/master/routes.js#L154 @ https://github.com/dimastopel/certdepot/blob/master/routes.js#L167

[dimastopel]

added basic escaping. thanks.