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Mondrian example is working in Mondrian
Add EditorType to Level
Add data_type to Level
Change Level editor_type to cardinality
Add sort_column to Level
Add date_dimension, user_dimension, count_measure, person_count_measure
Capitalize data_types on Level
Add column value to Measure
Add table value to Hierarchy
Add more documentation (CHANGELOG, CONTRIBUTING, LICENSE)
Clean up .gitignore
Add more rubies for TravisCI to test
Add yard, coveralls; Clean up Rakefile and spec_helper
Modify rubies for TravisCI to test
Add Mondrian Docs example, update README