updated test cases to verify that http.request counters are incremented for the /v1/submit, /v1/search and /v1/geolocate calls, but 4xx series errors are skipped for URL paths which we don't handle
Merge remote-tracking branch 'origin' into features/111-skip-40x-errors

Conflicts:
	ichnaea/service/geolocate/tests.py
Merge pull request #117 from crankycoder/features/111-skip-40x-errors

Skip 4xx errors to close #111