update underscore to 1.8.3

bower.json

@@ -25,7 +25,7 @@
     "zxcvbn": "*",
     "snapjs": "~2.0.0-rc1",
     "strengthify": "0.4.1",
-    "underscore": "~1.6.0",
+    "underscore": "~1.8.0",
     "bootstrap": "~3.3.5"
   }
 }

core/vendor/underscore/.bower.json

 {
   "name": "underscore",
-  "version": "1.6.0",
+  "version": "1.8.3",
   "main": "underscore.js",
   "keywords": [
     "util",
@@ -10,24 +10,26 @@
     "browser"
   ],
   "ignore": [
-    "underscore-min.js",
     "docs",
     "test",
     "*.yml",
-    "*.map",
     "CNAME",
     "index.html",
     "favicon.ico",
-    "CONTRIBUTING.md"
+    "CONTRIBUTING.md",
+    ".*",
+    "component.json",
+    "package.json",
+    "karma.*"
   ],
   "homepage": "https://github.com/jashkenas/underscore",
-  "_release": "1.6.0",
+  "_release": "1.8.3",
   "_resolution": {
     "type": "version",
-    "tag": "1.6.0",
-    "commit": "1f4bf626f23a99f7a676f5076dc1b1475554c8f7"
+    "tag": "1.8.3",
+    "commit": "e4743ab712b8ab42ad4ccb48b155034d02394e4d"
   },
   "_source": "git://github.com/jashkenas/underscore.git",
-  "_target": "~1.6.0",
+  "_target": "~1.8.0",
   "_originalSource": "underscore"
 }
\ No newline at end of file

core/vendor/underscore/LICENSE

-Copyright (c) 2009-2014 Jeremy Ashkenas, DocumentCloud and Investigative
+Copyright (c) 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative
 Reporters & Editors
 
 Permission is hereby granted, free of charge, to any person