Use invariant module instead of react's (deprecated)

Author: benvinegar

modules/History.js

@@ -1,4 +1,4 @@
-var invariant = require('react/lib/invariant');
+var invariant = require('invariant');
 var canUseDOM = require('react/lib/ExecutionEnvironment').canUseDOM;
 
 var History = {

modules/PathUtils.js

@@ -1,4 +1,4 @@
-var invariant = require('react/lib/invariant');
+var invariant = require('invariant');
 var assign = require('object-assign');
 var qs = require('qs');
 

modules/Route.js

@@ -1,5 +1,5 @@
 var assign = require('react/lib/Object.assign');
-var invariant = require('react/lib/invariant');
+var invariant = require('invariant');
 var warning = require('react/lib/warning');
 var PathUtils = require('./PathUtils');
 

modules/ScrollHistory.js

@@ -1,4 +1,4 @@
-var invariant = require('react/lib/invariant');
+var invariant = require('invariant');
 var canUseDOM = require('react/lib/ExecutionEnvironment').canUseDOM;
 var getWindowScrollPosition = require('./getWindowScrollPosition');
 

modules/components/Route.js

@@ -1,5 +1,5 @@
 var React = require('react');
-var invariant = require('react/lib/invariant');
+var invariant = require('invariant');
 var PropTypes = require('../PropTypes');
 var RouteHandler = require('./RouteHandler');
 

modules/createRouter.js

@@ -1,7 +1,7 @@
 /* jshint -W058 */
 var React = require('react');
 var warning = require('react/lib/warning');
-var invariant = require('react/lib/invariant');
+var invariant = require('invariant');
 var canUseDOM = require('react/lib/ExecutionEnvironment').canUseDOM;
 var LocationActions = require('./actions/LocationActions');
 var ImitateBrowserBehavior = require('./behaviors/ImitateBrowserBehavior');

modules/getWindowScrollPosition.js

@@ -1,4 +1,4 @@
-var invariant = require('react/lib/invariant');
+var invariant = require('invariant');
 var canUseDOM = require('react/lib/ExecutionEnvironment').canUseDOM;
 
 /**

modules/locations/StaticLocation.js

@@ -1,4 +1,4 @@
-var invariant = require('react/lib/invariant');
+var invariant = require('invariant');
 
 function throwCannotModify() {
   invariant(false, 'You cannot modify a static location');

modules/locations/TestLocation.js

@@ -1,4 +1,4 @@
-var invariant = require('react/lib/invariant');
+var invariant = require('invariant');
 var LocationActions = require('../actions/LocationActions');
 var History = require('../History');
 

package.json

@@ -48,6 +48,7 @@
     "react": "0.13.x||0.14.x"
   },
   "dependencies": {
+    "invariant": "^2.0.0",
     "object-assign": "^2.0.0",
     "qs": "2.4.1"
   },