Merge pull request #2 from micolous/issue-1

Fix for Issue #1: Only select interfaces that have a broadcast address available
Use colorsys stdlib module instead of homebrew implementation.

Conflicts:
	pylifx/__init__.py
Merge branch 'use-colorsys' into develop

Conflicts:
	pylifx/__init__.py
Merge branch 'master' of https://github.com/derkarnold/pylifx into develop