Send details as part of AppsError

the last mile module has been updated to pipe through additional properties.

src/apps.js

@@ -123,9 +123,10 @@ var appdb = require('./appdb.js'),
 
 // http://dustinsenos.com/articles/customErrorsInNode
 // http://code.google.com/p/v8/wiki/JavaScriptStackTraceApi
-function AppsError(reason, errorOrMessage) {
+function AppsError(reason, errorOrMessage, details) {
     assert.strictEqual(typeof reason, 'string');
     assert(errorOrMessage instanceof Error || typeof errorOrMessage === 'string' || typeof errorOrMessage === 'undefined');
+    assert(typeof details === 'object' || typeof details === 'undefined');
 
     Error.call(this);
     Error.captureStackTrace(this, this.constructor);
@@ -140,6 +141,8 @@ function AppsError(reason, errorOrMessage) {
         this.message = 'Internal error';
         this.nestedError = errorOrMessage;
     }
+
+    if (details) _.extend(this, details);
 }
 util.inherits(AppsError, Error);
 AppsError.INTERNAL_ERROR = 'Internal Error';