Fixing #3: Removing all "\n" characters from userData

By default encode("base64") adds "\n" after every 76 characters, so
longer email addresses were resulting in "\n" characters in the
userData, which sprintly doesn't handle.

Change-Id: Idc5bb168f201ddfbdd3002d8b748fac640853c43
Merge pull request #7 from ReturnPath/master

Fixing "#3: Invalid Credentials"