Fix setup.py homepage link. Closes #120.
Add Pearson coefficient calculation and tests. #103.
Merge branch 'pearson_correlation'
Credit latimes-calculate.
Add Micka O'Brien to AUTHORS.
Make ColumnType.create_column private. Closes #118.
Counts returns a dict. Closes #109.
Implemented DateTimeColumn. Closes #23.
Merge remote-tracking branch 'upstream/master'