Add shuffle support to write_h5_stack
Add relabel_connected function
Speed improvements, and safe casting
Add connectivity support
Improve performance by preallocating memory
Add filter module including sobel filtering
Bug fix: add sqrt to filter sum
Merge pull request #29 from jni/filter

Add a filter module for simple image filters
Merge pull request #28 from jni/hdf5-plus

Add shuffle support to write_h5_stack
Merge pull request #30 from jni/relabel

Add function to relabel connected components when no 0-boundary exists.
Add function to make vtk export easier
Add doctest example to extract_segments
Merge pull request #31 from jni/io-vtk

Add function to extract a few segments from a segmentation.