Update GettingStartedInPython.rst

Description of similarity maps added.
Update GettingStartedInPython.rst

Description of similarity maps
figures for documentation
Update GettingStartedInPython.rst

similarity maps for descriptors
figures for documentation
Update Cookbook.rst

scikit-learn and similarity maps for models
figures for similarity maps documentation
Merge branch 'master' of https://github.com/sriniker/rdkit
Update GettingStartedInPython.rst

update on similarity maps
code fixes in documentation of similarity maps
Update GettingStartedInPython.rst

Reference added for similarity maps.
figure for similarity map in cookbook
Update Cookbook.rst
Merge pull request #125 from sriniker/master

Documentation of similarity maps and scikit-learn