The hosting service implementations had been updated to work nicely on

Python 2.7 and 3.7, but still had issues on 3.5 and 3.6. On Python 3.5,

there were issues with json.loads() not accepting byte strings (they

added back support for this in 3.6), and on both 3.5 and 3.6 there were

dictionary ordering issues in the Bitbucket code (which only affected

unit tests).
Now, all the json.loads() calls make sure to decode the string first,

fixing the bulk of the issues. To fix the Bitbucket issues, we just

ensure we're sorting query parameters before building a query string,

and test against those sorted versions.

UNit tests pass on Python 2.7 and 3.5-3.7.