removed AxisIndex bug in MultiArrayStacker
added ArrayStacker unit test
introducing the unified labeling operator
fixed propDirty mechanism
further fixed propDirty, added unit test for it
changed output type to uint32, added checks and unit tests
add license files
initialize export file with full filepath

addresses ilastik #818
operator.py: fixme comment.
OrderedSignal: Added clean() method
testOpFormattedDataExport: Added an assert
OpH5WriterBigDataset: Flush data immediately after finishing write, and discard h5 file and dataset during cleanUp().
OpLabelVolume propagates dirtieness to CachedOutput, too
tests: Added some debug output to testOpFormattedDataExport.py
some cleanup in OplabelVolume
fixed background values in OpLabelVolume
using lazyflow's warn_deprecated instead of logging
Merge pull request #122 from burgerdev/stacker-bug

Ready to merge: removed AxisIndex bug in MultiArrayStacker
Merge branch 'master' into pr-CCL-refactoring

Conflicts:
	lazyflow/operators/opVigraLabelVolume.py
Merge pull request #123 from burgerdev/pr-CCL-refactoring

introducing the unified labeling operator