fix extension not working on context reloads (restarts)
- only collect context parameters on configure
- setup should be done as part of the lifecycle listener
update (test) dependencies - avoid (unused) mocha
do not set up workers in rackup mode e.g. `rails s trinidad`
add README notes on not setting up worker in rackup mode
update test config for resque workers
warn when :script worker param incorrectly set to a file
travis-ci test extension