Add pixel units
Update dummy cameras to use q.pixel
Update uca cameras to use q.pixel
Change color to the standard terminal color
Fix dummy storage ring
Cleanup imageprocessing module

Remove backprojection and fix flake8 issues.
flake8 fixes
Allow vector types in soft limits
Added positioners
Added detectors
Added imaging positioner

which allows us to move around by specifying
the distance in pixels.
Added dummy detector
Added detector test
Added dummy positioners
Added vector support to assert_almost_equal
Added Positioner and Axis tests
Add axes and positioners to the docs