Added password and existing user verification

-Updated password verification (password must now be between 4-32 chars
and contain >=1 numeric char
-Added conflict check to make sure user doesn't already exist. (at this
point i am simply using the email as username and verification as they
should all be unique anyway)
-If user exists, throw error(More needs to be done with this, IE account
recovery.)
-Also updated database insertion on successful register. Am now encrypting
PW's. (Noticed that i'd forgot that and was storing as plain text)