Updating travis configuration to explicitly run 'rake' behind bundle exec.
Specific patch version of 1.9.3: 362.
Revert "Specific patch version of 1.9.3: 362."

This reverts commit e4517c42af355f31745954c8d133a0461b3e2565.
Merge pull request #750 from mojombo/update-travis-config

Updating travis configuration to explicitly run 'rake' behind bundle exec