Conform to function declaration standards

- declare desc variable
- declare all positional arguments
- set the cmd
- properly handle DOKKU_APP_NAME

subcommands/start

@@ -5,9 +5,13 @@ source "$PLUGIN_BASE_PATH/common/functions"
 source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
 
 postgres-start-cmd() {
-  [[ -z $2 ]] && dokku_log_fail "Please specify a name for the service"
-  verify_service_name "$2"
-  service_start "$2"
+  declare desc="start a previously stopped $PLUGIN_SERVICE service"
+  local cmd="$PLUGIN_COMMAND_PREFIX:start" argv=("$@"); [[ ${argv[0]} == "$cmd" ]] && shift 1
+  declare SERVICE="$1"
+
+  [[ -z "$SERVICE" ]] && dokku_log_fail "Please specify a name for the service"
+  verify_service_name "$SERVICE"
+  service_start "$SERVICE"
 }
 
 postgres-start-cmd "$@"