set runner to null after run
make child process mocker to be a YUI library
use mock-child-process.js to inject header
add a YUI module to wrap mockchildprocess.js
update arrow FAQ about child process mocker
remove ignored tests
Merge pull request #98 from wangjungithub/mock_child_process

Mock child process
move mocked runer to yui seed
Merge branch 'master' of github.com:yahoo/arrow into bugfix
Merge branch 'bugfix' into proxy