Merge branch 'upstream_master' 

setup.py for v0.7 release 

Merge pull request veeresht#87 from BastienTr/Release_v0.6 Setup file for new release v0.6

Add test for FA 

Merge pull request veeresht#52 from veeresht/travis_python_2_removal Removed python 2.7 option from travis as code no longer supports python 2.

Merge pull request veeresht#25 from kirlf/patch-2 Update method visualize()

Updated doc-strings.