Merge pull request #53 from ChrisBeaumont/private_structures

Make structures_dict private
Added custom_position option to DendrogramPlotter.sort
Refactor I/O and auto-format detection
Fixed behavior and added more tests
Fix bug in save_dendrogram
Separate setting of custom positions into a separate method
Argument to set_custom_position should not be optional
Plural version of method makes more sense
Added set_custom_positions to API docs
Added note about default sorting
Merge pull request #62 from astrofrog/plotting-improvements

Added custom_position option to DendrogramPlotter.sort
Use namedtuple instead of dictionary for I/O handlers
Improvements to automated I/O routines
Merge pull request #63 from astrofrog/refactor-io

Refactor I/O code
Added initial algorithm page
Fixed API links
Typo fix
Use 'pixel' instead of 'value' where appropriate
Fixed typos
Merge pull request #65 from astrofrog/algorithm

Added initial algorithm page