Add dependencies

they are managed with bower, except sinon. there is no browser
build on bower for sinon and also no one on npm so far. in the
future they want to use browserify

Signed-off-by: Alexander Shorin <kxepal@apache.org>
diff --git a/bower.json b/bower.json
index 03a06fd..b9846fc 100644
--- a/bower.json
+++ b/bower.json
@@ -18,5 +18,10 @@
     "bower_components",
     "test",
     "tests"
-  ]
+  ],
+  "devDependencies": {
+    "mocha": "~1.20.1",
+    "jquery": "~2.1.1",
+    "chai": "~1.9.1"
+  }
 }