Merge pull request #799 from jam7/correct-quote-install.sh

Change install to fix quoting problem.

install.sh

@@ -86,7 +86,7 @@ function download_check () {
     case $? in
     0) ;;
     *)
-      echo 'Verification failed, something may be wrong with the $1 download.'
+      echo "Verification failed, something may be wrong with the $1 download."
       exit 1;;
     esac
 }