now you can run zerovm on container server

added a new feature that allows you to specify Swift container database as one of the input files for the instance
proxy middleware support for container jobs

added support for querying container db files
better detection of container query

currently the only channels that can be usable for running zerovm on container db are `stdin` and `input`
Merge pull request #59 from pkit/feature_container

support for running jobs over container sqlite3 database file