bugfix; path adopted to tool-labs to solve:
* <type 'exceptions.ImportError'>: No module named subster
* <type 'exceptions.ImportError'>: No module named query
* <type 'exceptions.IOError'>: [Errno 2] No such file or directory: '/data/project/data/subster/mail_inbox'

Change-Id: If9d2476ed40ca9a3e6d414fc01649b4efb89c6ee