Don't clobber global $DOMAIN variable

Closes #156

abra

@@ -808,17 +808,17 @@ ensure_stack_deployed() {
 }
 
 ensure_domain_deployed() {
-  DOMAIN=$1
+  local domain=$1
 
-  warning "Waiting for $DOMAIN to come up..."
+  warning "Waiting for $domain to come up..."
 
   idx=1
-  until curl --output /dev/null --silent --head --fail "$DOMAIN"; do
-    debug "Polled $DOMAIN $idx time(s) already"
+  until curl --output /dev/null --silent --head --fail "$domain"; do
+    debug "Polled $domain $idx time(s) already"
     sleep 3
     idx=$(("$idx" + 1))
     if [[ $idx -gt 10 ]]; then
-      error "$DOMAIN still isn't up, check status by running \"abra app ${STACK_NAME} ps\""
+      error "$domain still isn't up, check status by running \"abra app ${STACK_NAME} ps\""
     fi
   done
 }