[hack] Rename error node
[hack] Rename error node

Summary: "Error" is already meaningful in Javascript, so I've renamed this to ErrorSyntax / ErrorToken.

Reviewed By: jamesjwu

Differential Revision: D3970852

fbshipit-source-id: 75fb5f48ba1ca8c1d456fd994cfe75d74641106b

JonathanUsername/flow,facebook/flow,gabelevi/flow,jgrund/flow,gabro/flow,jamesgpearce/flow,claudiopro/flow,JonathanUsername/flow,JonathanUsername/flow,AprilArcus/flow,jamesgpearce/flow,mroch/flow,facebook/flow,popham/flow,MichaelDeBoey/flow,MichaelDeBoey/flow,facebook/flow,jgrund/flow,nmote/flow,gabelevi/flow,mroch/flow,jamesgpearce/flow,samwgoldman/flow,ylu1317/flow,AgentME/flow,ylu1317/flow,nmote/flow,samwgoldman/flow,jamesgpearce/flow,gabelevi/flow,samwgoldman/flow,claudiopro/flow,fletcherw/flow,claudiopro/flow,MichaelDeBoey/flow,jamesgpearce/flow,AgentME/flow,nmote/flow,ylu1317/flow,TiddoLangerak/flow,nmote/flow,fletcherw/flow,gabro/flow,popham/flow,samwgoldman/flow,mroch/flow,popham/flow,gabro/flow,samwgoldman/flow,popham/flow,jgrund/flow,popham/flow,MichaelDeBoey/flow,JonathanUsername/flow,jgrund/flow,JonathanUsername/flow,AgentME/flow,fletcherw/flow,jamesgpearce/flow,nmote/flow,TiddoLangerak/flow,jamesgpearce/flow,ylu1317/flow,gabelevi/flow,fletcherw/flow,mroch/flow,AgentME/flow,ForbesLindesay/flow,ylu1317/flow,ForbesLindesay/flow,AprilArcus/flow,AprilArcus/flow,popham/flow,gabro/flow,ForbesLindesay/flow,mroch/flow,AprilArcus/flow,JonathanUsername/flow,ForbesLindesay/flow,facebook/flow,mroch/flow,jgrund/flow,MichaelDeBoey/flow,TiddoLangerak/flow,facebook/flow,claudiopro/flow,samwgoldman/flow,gabro/flow,TiddoLangerak/flow,gabelevi/flow,JonathanUsername/flow,samwgoldman/flow,ForbesLindesay/flow,nmote/flow,gabelevi/flow,popham/flow,mroch/flow,facebook/flow,AprilArcus/flow,ForbesLindesay/flow,claudiopro/flow,fletcherw/flow,TiddoLangerak/flow,AprilArcus/flow,facebook/flow,fletcherw/flow,AgentME/flow,gabelevi/flow,gabro/flow,jgrund/flow,nmote/flow