Add --strip-root to flow ide
Add --strip-root to flow ide

Summary:
When we add tests for `flow ide`, it will be useful to run `flow ide`
with `--strip-root` so that the test output is independent of the test
directory.

Reviewed By: nmote

Differential Revision: D5659267

fbshipit-source-id: c5ed6785b68f5f46f10272c1ce970a2e353a139e

mroch/flow,JonathanUsername/flow,gabelevi/flow,MichaelDeBoey/flow,AgentME/flow,nmote/flow,AgentME/flow,jamesgpearce/flow,popham/flow,mroch/flow,TiddoLangerak/flow,JonathanUsername/flow,ylu1317/flow,claudiopro/flow,popham/flow,TiddoLangerak/flow,mroch/flow,JonathanUsername/flow,MichaelDeBoey/flow,JonathanUsername/flow,AgentME/flow,mroch/flow,facebook/flow,MichaelDeBoey/flow,nmote/flow,samwgoldman/flow,popham/flow,samwgoldman/flow,nmote/flow,facebook/flow,facebook/flow,mroch/flow,claudiopro/flow,gabelevi/flow,jamesgpearce/flow,popham/flow,samwgoldman/flow,TiddoLangerak/flow,ylu1317/flow,ylu1317/flow,jamesgpearce/flow,facebook/flow,popham/flow,nmote/flow,nmote/flow,mroch/flow,popham/flow,MichaelDeBoey/flow,facebook/flow,nmote/flow,JonathanUsername/flow,gabelevi/flow,popham/flow,TiddoLangerak/flow,samwgoldman/flow,JonathanUsername/flow,AgentME/flow,claudiopro/flow,facebook/flow,gabelevi/flow,gabelevi/flow,MichaelDeBoey/flow,gabelevi/flow,claudiopro/flow,jamesgpearce/flow,claudiopro/flow,AgentME/flow,TiddoLangerak/flow,mroch/flow,gabelevi/flow,samwgoldman/flow,JonathanUsername/flow,facebook/flow,ylu1317/flow,jamesgpearce/flow,jamesgpearce/flow,samwgoldman/flow,samwgoldman/flow,jamesgpearce/flow,ylu1317/flow,nmote/flow