Add a hard timeout to initializing the SSH connection
Add log message when SSH connection times out
Send timeout option to Net::SSH when opening connection
Increase hard timeout on SSH connections to 15 seconds
Fix require statement for HardTimeout
Fix HardTimeout call
sauce_labs: Make all private methods private

Knowing what methods are used outside of the class makes it easier to
refactor.
Refactor Job::Runner

Cleaned up the start method a bit and removed some duplication.
Fix conditional for closing the SSH session

The session method will create a session if one doesn't exist, which
defeats the purpose of it.
runner: Split up upload_and_run_script

This allows us to easily specify different timeouts for uploading and
running the script.
Fix syntax error in runner
Merge branch 'master' into osx-production
fix(runner): run the build script using login bash

This is needed until travis-ci/travis-build#168 is merged.
chore(Gemfile): update travis-build
Merge branch 'master' into osx-production
feat(sauce-labs): allow to pass a custom image with the payload
fix(osx): use a per-image keychain password

The password can change from image to image, and since we now allow
running different images on the same worker we need to be able to
specify the password per image.
Merge branch 'master' into osx-production

Conflicts:
	Gemfile.lock
	lib/travis/worker/job/runner.rb
Merge branch 'master' into osx-production

Conflicts:
  lib/travis/worker/job/runner.rb
  Gemfile.lock
Update travis-build