Merge branch 'upstream_master'

setup.py for v0.7 release

Merge pull request #87 from BastienTr/Release_v0.6

Setup file for new release v0.6

Add test for FA

Merge pull request #52 from veeresht/travis_python_2_removal

Removed python 2.7 option from travis as code no longer supports python 2.

Merge pull request #25 from kirlf/patch-2

Update method visualize()

Updated doc-strings.