Composing should be loaded from options only.

Author: mshima

lib/index.js

@@ -377,10 +377,7 @@ class Generator extends EventEmitter {
       });
     }
 
-    this.composing =
-      this.options.composing || this.env.composing
-        ? this.env.composing(this.destinationPath())
-        : undefined;
+    this.compose = this.options.compose;
 
     // Expose utilities for dependency-less generators.
     this._ = _;