Update bootstrap bower version to support only 3.x variants

bower.json

@@ -25,7 +25,7 @@
     ],
     "dependencies": {
         "jquery": ">= 1.9.0",
-        "bootstrap": "~3.0"
+        "bootstrap": "~3"
     },
     "license": "BSD-3-Clause",
     "ignore": [
@@ -37,4 +37,4 @@
         "test",
         "tests"
     ]
-}
+}