disables asset pipeline log
tells ruby not to buffer stdout

See:

  * https://github.com/ddollar/foreman/wiki/Missing-Output
  * http://stackoverflow.com/questions/9953435/why-does-foreman-not-output-some-things-until-i-press-control-c
silences debugging output from spork, eg.

Running tests with args ["./test/controllers/home_controller_test.rb", "./test/decorators/user_decorator_test.rb", "./test/integration/example_integration_test.rb", "./test/integration/sign_in_test.rb", "./test/models/user_test.rb", "./test/test_helper.rb"]...
a quieter guard