Bug fix release

Address comments raised in #44.

• Add MANIFEST.in file to ensure Cython source files are packaged.
• Update outdated requirement docs.
• Update libtiff import.

Original gala release

Announcing the first ever release of gala!

Gala provides many agglomerative segmentation algorithms, including the eponymous graph-based active learning of agglomeration. (See Nunez-Iglesias et al, PLOS ONE, 2013.) It also includes supporting modules for morphology, IO, and evaluation.

Happy segmenting!