Fix bcrypt warnings

[hannahherbig]

gen_salt and encrypt are now deprecated in favor of genSalt and hash. I also changed the code to just call bcrypt.hash with the desired salt length instead of generating the salt separately. Less code that does the same job. :)

[csi-lk]

This really needs to be added in, bcrypt fails in the current implementation as there is no longer a function gen_salt

Thanks for the solution

[sespindola]

Merging, thanks.