Fix "arc" when `arcanist/` lives in some directory with spaces in the name
Fix "arc" when `arcanist/` lives in some directory with spaces in the name

Summary: This shell script needs more quotes.

Test Plan: Ran "arc" with `arcanist/` inside a directory called `s p a c e s`.

Reviewers: irinav, vrana

Reviewed By: vrana

CC: aran

Differential Revision: https://secure.phabricator.com/D5265

Symplicity/arcanist,codelabs-ch/arcanist,KieranHayes/arcanist,haskell-infra/arcanist,calblueprint/arcanist,folsom-labs/arcanist,zhihu/arcanist,sneakpeeq/arcanist,haskell-infra/arcanist,codelabs-ch/arcanist,r4nt/arcanist,sneakpeeq/arcanist,calblueprint/arcanist,fivestars/arcanist,eSpark/arcanist,alexmv/arcanist,wxstars/arcanist,fivestars/arcanist,aik099/arcanist,folsom-labs/arcanist,coursera/arcanist,Symplicity/arcanist,memsql/arcanist,fivestars/arcanist,codelabs-ch/arcanist,zhihu/arcanist,r4nt/arcanist,sneakpeeq/arcanist,wharris/arcanist,Symplicity/arcanist,uber/arcanist,hach-que/arcanist,PageUpPeopleOrg/arcanist-patches,wxstars/arcanist,memsql/arcanist,kevinseelbach/arcanist,KieranHayes/arcanist,alexmv/arcanist,dguo-coursera/arcanist,phacility/arcanist,chundongwang/arcanist,zhihu/arcanist,coursera/arcanist,jra3/arcanist,PageUpPeopleOrg/arcanist-patches,r4nt/arcanist,sneakpeeq/arcanist,wikimedia/phabricator-arcanist,aik099/arcanist,hach-que/arcanist,phacility/arcanist,alexmv/arcanist,wxstars/arcanist,julkiewicz/arcanist,dguo-coursera/arcanist,phacility/arcanist,chundongwang/arcanist,julkiewicz/arcanist,eSpark/arcanist,folsom-labs/arcanist,julkiewicz/arcanist,codelabs-ch/arcanist,Symplicity/arcanist,fivestars/arcanist,coursera/arcanist,dguo-coursera/arcanist,uber/arcanist,PageUpPeopleOrg/arcanist-patches,Khan/arcanist,uber/arcanist,wxstars/arcanist,Khan/arcanist,phacility/arcanist,uber/arcanist,aik099/arcanist,hach-que/arcanist,aik099/arcanist,chundongwang/arcanist,alexmv/arcanist,PageUpPeopleOrg/arcanist-patches,wharris/arcanist,zhihu/arcanist,wikimedia/phabricator-arcanist,memsql/arcanist,jra3/arcanist,hach-que/arcanist,jra3/arcanist,wharris/arcanist,codelabs-ch/arcanist,KieranHayes/arcanist,wikimedia/phabricator-arcanist,calblueprint/arcanist,r4nt/arcanist,phacility/arcanist,haskell-infra/arcanist,eSpark/arcanist,wikimedia/phabricator-arcanist,julkiewicz/arcanist,kevinseelbach/arcanist,memsql/arcanist,Khan/arcanist,calblueprint/arcanist,eSpark/arcanist,chundongwang/arcanist,haskell-infra/arcanist,Khan/arcanist,KieranHayes/arcanist,kevinseelbach/arcanist,coursera/arcanist,jra3/arcanist,wharris/arcanist,kevinseelbach/arcanist,folsom-labs/arcanist,dguo-coursera/arcanist