Merge pull request #68 from calabash/release-0.10.1

Release 0.10.1
Merge pull request #71 from calabash/release-0.10.2

Release 0.10.2
Merge pull request #77 from calabash/release-0.11.0

Release 0.11.0
Update the CONTRIBUTING docs
Add blurb to README about failing Travis CI
Merge pull request #80 from calabash/release/0.11.1

release 0.11.1
Merge branch 'master' into develop