Fits export
Better default for vaxis metadata
coerce idx -> int
Dendrogram indices recomputed when loaded
Merge pull request #49 from astrofrog/consolidate-licenses

Consolidate licenses
Added fits export discussion to documentation
Merge pull request #50 from ChrisBeaumont/fits

Fits export
Avoid deep recursion in newick calculation
Benchmark dendrogram tests
benchmark data in setup.py
relative import
Merge pull request #52 from ChrisBeaumont/benchmarks

Benmark tests
Added start of migration guide for users of previous versions of astrodendro
Added acknowledgment section and make developer list more uniform
Added migration guide link to main docs page
Minor fixes to migration guide