Refactor application and filter descriptors. Also fixed plugin framework for filters.
Merge branch 'master' of https://github.com/VOLTTRON/openeis

Conflicts:
	openeis/applications/load_duration.py
Merge branch 'master' of https://github.com/VOLTTRON/openeis
Merge branch 'master' of https://github.com/VOLTTRON/openeis

Conflicts:
	openeis/applications/daily_summary.py