Bump version to 1.6.12

Now explicitly require faraday_middleware 0.9.1 and up.
This should mitigate problems like
https://github.com/travis-ci/travis-ci/issues/2419.
Merge branch 'master' of github.com:travis-ci/travis.rb
Fix faraday_middleware version dependency
Pin pry to 0.9.x

0.10.0 breaks Ruby 1.8.7-compatibility
Record 1.6.12 changes

Only functional changes are recorded here
Add files needed for Deis and Hackage support

Previous commits did not include these.
Bump version to 1.6.13

Previous change log stated that 1.6.12 supported Deis and Hackage
setup support, but that was incorrect; the gemspec did not
include the necessary files.
update travis.gemspec, too
add lint command
Merge branch 'rkh-lint'
update version history
regenerate gemspec and completion
v1.6.14