Added initial files needed for documentation
Initial documentation
Split up documentation into multiple pages
Added diagrams to introduction
Updated API description in docs
Merge pull request #20 from ChrisBeaumont/index

Efficient indexing
Merge pull request #12 from astrofrog/initial-docs

Documentation for dendro-core
Updated README to avoid duplicate information with documentation
Clarified scope and status of package.
Added source file for diagrams
Renamed ``min_data_value`` to ``min_value`` and added a few docstrings
Changed order of arguments mentioned in docs to match method signature
Updated ``min_data_value`` to ``min_value`` in tests
Merge pull request #26 from astrofrog/doc-updates

Documentation updates
Merge pull request #27 from astrofrog/added-diagram

Added source file for diagrams
Merge pull request #28 from astrofrog/docstrings

Added a few docstrings
Sketching out interface for analysis
Implemented PPV statistics
Astropy tables, metadata checking
Revered accidential deletion of TreeIndex while rebasing