Fix variable scope and heredoc escaping issue in completion hook

Author: glensc

src/CompletionHandler.php

@@ -355,9 +355,10 @@ public function generateBashCompletionHook($programName = null)
         return <<<"END"
 function $funcName {
     export COMP_LINE COMP_POINT COMP_WORDBREAKS;
+    local RESULT STATUS;
 
     RESULT=`$command _completion`;
-    STATUS=$?;
+    STATUS=\$?;
 
     if [ \$STATUS -ne 0 ]; then
         echo \$RESULT;
@@ -394,4 +395,4 @@ public function addHandler(Completion $helper)
     {
         $this->helpers[] = $helper;
     }
-}
+}