Updated newport74000 monochromator
Put connection in the constructor
Corrected port initialization for EdmundOptics photodiode
Merge pull request #261 from ufo-kit/EdmundOptics

Corrected port initialization for EdmundOptics photodiode
Disable Python 3 for the moment
Merge pull request #253 from ufo-kit/newport

Updated newport74000 monochromator
Upgrade of conversion between entered and transmitted value.
Merge pull request #262 from ufo-kit/monochromator

Upgrade of conversion between entered and transmitted value.
Move write_images to concert.storage

because of a future circular dependency between
coroutines.sinks and storage modules
Don't append file extensions by writers
Add file system walker

and image-based implementations. Fixes #259.
Update experiments to use walkers
Fix pep8 in concert.experiments.base
Update experiment tests
Merge pull request #260 from ufo-kit/generalize-acquisitions

Generalize acquisitions
Allow nonabsorptivity by computing rotation axis
Remove colored exception output

Trying to import IPython exception printer imports all kinds of things,
resulting in slow concert binary run-time without doing anything. If this is
really required it should be moved to a function that imports the formatter at
run-time. However, I strongly object this because the async module should be
free of any view related code.
Make dark_row and flat_row keyword arguments

in FlatCorrectedBackproject. One might want to set it just before
the reconstruction starts.
Make the default color blue even after clear

if it is not set by the user explicitly in PyplotViewer.
Fix colormap limits for images with zero variance