Less strict six requirement, support id_str field in rules, test updates

• Support for id_str field that gnip adds to rules.
• Less strict six requirement.
• Use python 3.6 in tests.

Connected status & backfill minutes feature on connect

Also allows id as a valid optional key in the dictionary when defining rules.

Bugfix - don't require both url and rules_url

Merge pull request #21 from j-bennet/master

Resolve config should not require both url and rules_url.

PowerTrack 2.0 Rules API Update

0.6.0

Add Makefile so I don't forget how to update PyPI

Fixing pinned requests dependency

0.5.2

Fixing pinned requests dependency. Closes #17.

Bugfix for Rules URL generation

Merge pull request #16 from abh1nav/bugfix/15

Adding check for existing query strings in GNIP URL

Minor changes were made to make the code compatible with Python 3

0.5.0

Bump date on license file

Version bump because of PyPI upload issue with 0.4.5

0.4.6

Bumping version number because of PyPI upload issue

Empty environment variables no longer override a valid config file

0.4.5

Version bump and fixing a typo in the CLA template.

Bugfix for delete_rules

Rule validation fails when tag is None.

Fixes #9.