Fixed error when user fails to enter correct password

Pappy would raise exceptions and continued project in clear-text
when the user failed to enter the correct decryption password.

Added a boolean status variable to config `crypt_success` that
gets set to true when project decrypts correctly, otherwise it
is set to false.

pappyproxy/config.py

@@ -170,6 +170,7 @@ class PappyConfig(object):
         self.crypt_dir = 'crypt'
         self.crypt_file = 'project.crypt'
         self.crypt_session = False
+        self.crypt_success = False
         self.salt_file = 'project.salt'
     
     def get_default_config(self):