Validate public key format

nc-173
Fix ssh key validator, add unittests for the ssh key

nc-173
Merge branch 'develop' into feature/nc-173
Fix tests for ssh public key validation

nc-173
Merge branch 'develop' into feature/nc-173
Add tests for public key with comment

nc-173
Merge branch 'feature/nc-173' into 'develop'

Feature/nc 173

ssh-rsa public key validation:
http://stackoverflow.com/questions/2494450/ssh-rsa-public-key-validation-using-a-regular-expression/2494645#2494645