Fix #71: add code_of function

In case Pygments is installed, the code is colorized first.
Use correct import path for IPython 0.12 ...
Fixed dispatcher import in sinks
Require frame-rate parameter
Frame rate parameter added to dummy cameras
Fix test using dummy camera
Move ui/commands to commands and ui/ to ui module
Move asynchronous.* and coroutine funcs to helpers
Remove feedbacks
Remove the process package in favor of a module
Remove the measures package in favor of a module
Test updates due to the measures module
Do not require a Scanner object in TomographicRotationAxisAligner
TomographicRotationAxisAligner -> RotationAxisAligner
Rotation axis tests update
Import dispatcher to concert.processes
Remove the optimization package in favor of a module
Test updates due to the optimization module
Halver optimizer default initial step bugfix to make the tests pass again
Removed old unused Process class import from concert.session