[easy] add printer for ShapeT
[easy] add printer for ShapeT

Summary: a `$Shape<T>` annotation no longer makes `flow dump-types` throw.

Reviewed By: @avikchaudhuri

Differential Revision: D2453361

facebook/flow,JohnyDays/flow,popham/flow,jeffmo/flow,facebook/flow,chenglou/flow,jamesgpearce/flow,fletcherw/flow,KevinTCoughlin/flow,danvk/flow,AgentME/flow,graue/flow,mroch/flow,AprilArcus/flow,d14b3l/flow,nmote/flow,mcanthony/flow-type,d14b3l/flow,ForbesLindesay/flow,shiftcars/flow,OCamlPro/flow,graue/flow,nmote/flow,Fresheyeball/flow,gabro/flow,jeffutter/flow,graue/flow,gabelevi/flow,nmote/flow,JonathanUsername/flow,MichaelDeBoey/flow,cesarandreu/flow,jeffmo/flow,jeffutter/flow,jgrund/flow,samwgoldman/flow,gabelevi/flow,jgrund/flow,TiddoLangerak/flow,jdelStrother/flow,KevinTCoughlin/flow,fletcherw/flow,KevinTCoughlin/flow,facebook/flow,graue/flow,gabro/flow,ForbesLindesay/flow,ForbesLindesay/flow,JonathanUsername/flow,ForbesLindesay/flow,Eyyub/flow,jdelStrother/flow,AprilArcus/flow,Fresheyeball/flow,d14b3l/flow,gabro/flow,cesarandreu/flow,chenglou/flow,jdelStrother/flow,jamesgpearce/flow,jeffutter/flow,TiddoLangerak/flow,samwgoldman/flow,JohnyDays/flow,popham/flow,nmote/flow,jamesgpearce/flow,jeffmo/flow,jdelStrother/flow,d14b3l/flow,claudiopro/flow,ylu1317/flow,jamesgpearce/flow,danvk/flow,KevinTCoughlin/flow,claudiopro/flow,jeffmo/flow,popham/flow,gabelevi/flow,JonathanUsername/flow,jamesgpearce/flow,shiftcars/flow,jgrund/flow,darioajr/flow,fletcherw/flow,gabelevi/flow,mroch/flow,mcanthony/flow-type,shiftcars/flow,jeffmo/flow,AprilArcus/flow,chenglou/flow,popham/flow,cesarandreu/flow,jdelStrother/flow,gabelevi/flow,jamesgpearce/flow,jamesgpearce/flow,MichaelDeBoey/flow,ForbesLindesay/flow,JonathanUsername/flow,jgrund/flow,claudiopro/flow,chenglou/flow,AprilArcus/flow,OCamlPro/flow,facebook/flow,TiddoLangerak/flow,jdelStrother/flow,darioajr/flow,mroch/flow,AprilArcus/flow,jgrund/flow,ylu1317/flow,asivitz/flow,ForbesLindesay/flow,jeffmo/flow,popham/flow,MichaelDeBoey/flow,facebook/flow,chenglou/flow,mcanthony/flow-type,claudiopro/flow,d14b3l/flow,popham/flow,samwgoldman/flow,JonathanUsername/flow,gabelevi/flow,AgentME/flow,cesarandreu/flow,nmote/flow,AprilArcus/flow,graue/flow,OCamlPro/flow,mroch/flow,claudiopro/flow,JonathanUsername/flow,samwgoldman/flow,AgentME/flow,nmote/flow,mroch/flow,graue/flow,shiftcars/flow,Eyyub/flow,Eyyub/flow,Fresheyeball/flow,popham/flow,TiddoLangerak/flow,shiftcars/flow,gabro/flow,Eyyub/flow,chenglou/flow,fletcherw/flow,gabro/flow,AgentME/flow,Fresheyeball/flow,mroch/flow,gabelevi/flow,darioajr/flow,MichaelDeBoey/flow,ylu1317/flow,danvk/flow,asivitz/flow,samwgoldman/flow,samwgoldman/flow,mcanthony/flow-type,TiddoLangerak/flow,ylu1317/flow,gabro/flow,AgentME/flow,ylu1317/flow,MichaelDeBoey/flow,fletcherw/flow,asivitz/flow,jeffutter/flow,shiftcars/flow,JohnyDays/flow,jgrund/flow,JonathanUsername/flow,danvk/flow,samwgoldman/flow,d14b3l/flow,asivitz/flow,darioajr/flow,facebook/flow,fletcherw/flow,mroch/flow,JohnyDays/flow,OCamlPro/flow,facebook/flow,nmote/flow