Don't crash on nil environment definition
Merge pull request #175 from gtd/fix-nil-environment-definition

Legacy ey.yml crashes `ey environment` opaquely
Update README to include message about Ruby 1.8 support
Merge pull request #178 from engineyard/ruby19-readme

Update README to include message about Ruby 1.8 support
Bump engineyard-serverside to 2.3.9 which includes many bugfixes
Merge pull request #179 from engineyard/serverside-2.3.9

Bump engineyard-serverside to 2.3.9 which includes many bugfixes
Update .travis.yml to only build ruby targets >= 1.9.3
Merge pull request #180 from engineyard/drop-18-travis

Update .travis.yml to only build ruby targets >= 1.9.3
Use net-ssh with keep alive. Set server keep alive to 60

This will help avoid dropped connections during long processes.