Merge tag 'issue_20' into develop

V0.1

fixes #20 bug where xmarkers stay on stations when another route is requested
Merge tag '0.2' into develop

releasing version 0.2
fixes #30
Merge branch 'hotfix/0.1' into develop
fixes #27
feature fixes #23
Merge branch 'feature/issue23' into develop
Merge branch 'master' of https://github.com/summer-of-open-source/wheel-chair-accessible-google-maps into develop
Merge branch 'feature/issue27' into develop