Code review comment for lp:~pitti/platform-api/test-backend

More code review appreciated, but so far I'm happy with this as a first version. Plan:

- Wait for process-cpp to land, then bump build-dep on it in this MP
- Get this MP landed
- Add some high-level integration tests to qtubuntu-sensors which use the QtSensors API, to make sure that qtsensors-opensource-src → qtubuntusensors → platform-api communication all works (not blocked by the above, can be developed in parallel)
- land these tests

After that we should meet with some app developers to discuss what kind of more abstract events they would like to get, and add them to our sensor test API (the file parser).