added install to Makefile; run flake before install on travis
api_pricing renamed to api_scrooge
modified usages report
api to push pricing service usages
added GET pricing service usages API
collect plugin fixes; fixed default usage type type
Merge pull request #267 from mkurek/feature/makefile-tweak

added install to Makefile; run flake before install on travis
Merge pull request #268 from mkurek/feature/rename-assets-api

api_pricing renamed to api_scrooge
Merge pull request #269 from mkurek/feature/usages-report2

modified usages report
Merge pull request #272 from mkurek/feature/services-api

api to push pricing service usages
Merge branch 'services' into feature/clean-models

Conflicts:
	src/ralph_scrooge/tests/utils/factory.py