Polyswarm-api

Bug Fix

* Set the limit on the `stream`'s `--since` argument to 2800 minutes (2 days) to match `polyswarm-cli`.

Features

* Added a lot of unit testing
* Standardize result objects

Fixes

* Fix tests and packaging for python2.7

Features
- Make exception handling more explicit.

Fixes
- Fix hunt formatter in certain error conditions.

Fixes
- Handle case when hunts have results, but filter did not return any.

Fixes
- Remove debug print on PolyScore
- Don't request PolyScore unless needed

Major changes
- Separated CLI into https://github.com/polyswarm/polyswarm-cli . `pip install polyswarm` for the CLI from now on.
- Added PolyScore support, for better context to engine results.