Merge pull request #149 from ariovistus/master

0.2.1 release
Merge pull request #150 from ariovistus/master

#128 plus docs
Refactored tox config using generative envs
Updated Travis config
Added requirements section
Fixed alignment
Fixed misplaced alignment
Merge pull request #154 from NextHub/master

Remove boilerplate code from tox config
fix #153