DOC: New docstrings for utilfuncs, inherited by their Models. Also updated docstrings for Model and fit()
ENH/TST: fit result has handy attributes. Includes associated tests.
DOC: Make README a markdown file and add a Travis build status badge.

closes #61
Merge pull request #70 from danielballan/travis-badge

DOC: Make README a markdown file and add a Travis build status badge.
Merge pull request #71 from danielballan/models

ENH/DOC: Add handy result attributes and various docstring improvements.