Changed an import for consistency with sklearn
Changed all the imports to be sklearny
One more import
Made earth imports relative
Basis now knows how many variables to expect
Added ValueError on using X with the wrong number of columns
Raise an exception for sparse inputs
Improved sparse checking; added scipy as dependency
Removed unused import
autopep8 on earth.py
autopep8 everything
got excited about autopep8
Merge pull request #48 from jcrudy/sklearn

Sklearn