Fix GA_KEY_CONTENT OpenSSL crypto error

OpenSSL.crypto.load_privatekey can't detect start line due to a
str.replace() for '\n' and '\r'.
json.loads() can't handle '\n' and '\r' cause it thinks they are
control character.
Therefore '\n' and '\r' have to be double escape rather than deleted.
OpenSSL.crypto.load_privatekey() can't handle '\r' either,
so a private_key with '\r' wouldn't work anyway. ¯\_(ツ)_/¯

Error:
OpenSSL.crypto.Error: [('PEM routines', 'get_name', 'no start line')]

Ref:
tomdyson#25
https://stackoverflow.com/a/45571017

wagalytics/views.py

@@ -54,7 +54,7 @@ def get_access_token_from_str(ga_key_content):
  SCOPE = 'https://www.googleapis.com/auth/analytics.readonly'
 
  # Construct a credentials objects from the key data and OAuth2 scope.
- keyDict = json.loads(ga_key_content.replace('\n', '').replace('\r', ''))
+ keyDict = json.loads(ga_key_content.replace('\n', '\\n'))
  _credentials = ServiceAccountCredentials.from_json_keyfile_dict(
  keyDict, SCOPE)