Import subset of underscore.string scripts only

Require individual methods like `classify` instead of the whole module.
This reduces the size of the browser bundle from ~27kb down to ~2kb.

lib/application.js

@@ -8,7 +8,8 @@ var assert = require('assert');
 var fs = require('fs');
 var extend = require('util')._extend;
 var RemoteObjects = require('strong-remoting');
-var stringUtils = require('underscore.string');
+var classify = require('underscore.string/classify');
+var camelize = require('underscore.string/camelize');
 var path = require('path');
 
 /**
@@ -361,14 +362,6 @@ app.boot = function(options) {
     '`app.boot` was removed, use the new module loopback-boot instead');
 };
 
-function classify(str) {
-  return stringUtils.classify(str);
-}
-
-function camelize(str) {
-  return stringUtils.camelize(str);
-}
-
 function dataSourcesFromConfig(config, connectorRegistry) {
   var connectorPath;
 

lib/model.js

@@ -6,7 +6,6 @@ var assert = require('assert');
 var RemoteObjects = require('strong-remoting');
 var SharedClass = require('strong-remoting').SharedClass;
 var extend = require('util')._extend;
-var stringUtils = require('underscore.string');
 
 /**
  * The base class for **all models**.