Added package.json to manage development dependancies. Fixes #16

Updated the README to reflect the new setup procedure.

README.markdown

@@ -84,7 +84,7 @@ Development
 
 If you wish to develop annotator, you'll need to have a working installation of [Node.js][node] (v0.2.x). I'd highly recommend installing both Node.js and the [Node Package Manager][npm], after which you can run the following to get up and running:
 
-    npm install coffee-script@1.0.0 jsdom@0.1.21 htmlparser@1.7.3
+    npm install .
 
 If that worked, you should be able to run the tests:
 

package.json

@@ -0,0 +1,15 @@
+{
+  "name": "annotator",
+  "version": "1.0.0beta3",
+  "description": "Inline annotation for the web. Select text, images, or (nearly) anything else, and add your notes.",
+  "repositories": [
+    {
+      "type": "git",
+      "url": "http://github.com/okfn/annotator.git"
+    }
+  ],
+  "dependencies": {
+    "coffee-script": "1.0.1",
+    "jsdom": "0.1.23"
+  }
+}