Fixed confusing documentation in SenseApi. (see issue #54)
Removed old unused "app secrets" that guarded the session ID. Not very
secure to have these secrets in version control, and they are no longer
needed now the Service is not exported to other apps.
Changed log levels to prevent confusion about errors being logged when a
sensor ID was not found. (see issue #54)
Merge pull request #59 from senseobservationsystems/fix_sense_api_docs

Fix sense api docs