Add child_process stub to workaround browserify/module-deps#66

Author: deathcap

child_process.js

@@ -0,0 +1,11 @@
+
+// stub http://nodejs.org/api/child_process.html
+
+module.exports = {
+  // module-deps 3.6.4 imports child_process.spawn, even though it doesn't need it:
+  // (can remove after) https://github.com/substack/module-deps/pull/66
+  spawn: function(command, args, options) {
+           console.log('child_process.spawn ignored:',command,args,options);
+         }
+};
+