Merge pull request #106 from ami-lab/f/#92-PDU-for-recording

F/#92 pdu for recording
Open for reading + open for writing generator. (#96)
open() -> open_for_writing(). (#96)
Putting created_at on messages at their entry in the processing pipeline. (#96)
MeasurementsPlayer without drop policy. (#96)
added filter_export.py and intervals.py
Merge branch 'master' of github.com:ami-lab/AmI-Platform
Merge pull request #109 from ami-lab/f/#96-measurement-player

F/#96 measurement player
Added recording PDU as upstart + monit service.
Connecting to Mongo via MongoEngine + added main method.
Sending measurements to recorder as well.
Hack
Merge branch 'master' of git://github.com/ami-lab/AmI-Platform
ami-sensor-kinect must be executable.
Fixing API
Merge branch 'master' of github.com:ami-lab/AmI-Platform
Added play command.
Merge branch 'master' of github.com:ami-lab/AmI-Platform
OpenCV installation script temp fix.
Added packet for pipeline tests and test for head_crop
Corrected measurements_player