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' has 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)