Issue #139: remove util/Config (and then util/Map)

- Removed util/Config and util/Map (because only util/Config depended on it)
  and unit tests
- Side effect: mvc/Model depended on Config, but only to get the apiRoot in
  Model#getApiURL. We now do that in project-specfic Service classes, so I
  removed that method.
- Side effect: mvc/Application depended on Config, which it passed to
  Application#beforeInit for subclasses to override. My line of thinking is
  that subclasses can load this themselves.

src/mvc/Application.js

@@ -6,8 +6,7 @@ define(function(require) {
     EventDispatcher = require('lavaca/events/EventDispatcher'),
     router = require('lavaca/mvc/Router'),
     viewManager = require('lavaca/mvc/ViewManager'),
-    Connectivity = require('lavaca/net/Connectivity'),
-    Config = require('lavaca/util/Config');
+    Connectivity = require('lavaca/net/Connectivity');
 
   function _stopEvent(e) {
     e.preventDefault();
@@ -53,7 +52,7 @@ define(function(require) {
       this._callback = callback.bind(this);
     }
     Device.init(function() {
-      this.beforeInit(Config)
+      this.beforeInit()
         .then(this.init.bind(this));
     }.bind(this));
   }, {
@@ -223,11 +222,9 @@ define(function(require) {
      * Handles asynchronous requests that need to happen before Application.init() is called in the constructor
      * @method {String} beforeInit
      *
-     * @param {Lavaca.util.Config} Config cache that's been initialized
-     *
      * @return {Promise}  A promise
      */
-    beforeInit: function(Config) {
+    beforeInit: function() {
       return Promise.resolve(null);
     }
   });

src/mvc/Model.js

@@ -6,8 +6,7 @@ define(function(require) {
       clone = require('mout/lang/deepClone'),
       contains = require('mout/array/contains'),
       removeAll = require('mout/array/removeAll'),
-      merge = require('mout/object/merge'),
-      Config = require('lavaca/util/Config');
+      merge = require('mout/object/merge');
 
 
   var UNDEFINED;
@@ -382,23 +381,6 @@ define(function(require) {
         return _isValid(messages);
       }
     },
-    /**
-     * Converts a relative path to an absolute api url based on environment config 'apiRoot'
-     * @method getApiURL
-     *
-     * @param {String} relPath  A relative path
-     * @return {String}  A formated api url or an apparently bad url '/please_set_model_url' if relPath argument is faslsy
-     */
-    getApiURL: function(relPath) {
-      var badURL = '/please_set_model_url',
-          apiRoot = Config.get('apiRoot'),
-          apiURL;
-      if (!relPath) {
-        return badURL;
-      }
-      apiURL = (apiRoot || '') + relPath;
-      return apiURL;
-    },
     /**
      * Converts this model to a key-value hash
      * @method toObject