unit test for export formats
[ExportSlot] added maintainable format information
Merge branch 'master' into export-formats
seperate items by semicolon, clarify message
removed debug print statement
classifier: log the average OOB
OpFeatureMatrixCache: Moved some code out of the block requests and into the main request to avoid some lock contention.
OpPixelFeaturesPresmoothed: Discard any description string in the channel axistags, since the feature channels have a different meaning than the input channels.
Fixes ilastik/ilastik#1023
submodules: Updated pydvid
OpDvidVolume: Extend default timeout even for default accessor.
OpDvidVolume: Default accessor does not force a throttle setting one way or the other.
OpCompressedUserLabelArray: Added ingestData() for importing label values from an external slot in a block-by-block manner.
See also: ilastik/ilastik#167
lazyflow/rtype.py: Check to see if the roi's stop value is beyond the shape. If so, provide an assertion.
classifiers: Added feature_count to the classifier ABC.
docs: Added classifiers docs
docs: Minor cleanups.
roi.py: Added slicing_to_string()
OpCompressedUserLabelArray: Added Projection2D slot (needs optimization)
OpCompressedUserLabelArray: Vastly improved performance by ignoring missing blocks.
OpCompressedArray: Projection2D colors are inverted so that objects in low-numbered slices occlude objects in high-numbered slices.