set up package.json for npm publishing

package.json

@@ -0,0 +1,12 @@
+{
+  "name": "bowser",
+  "description": "a browser detector",
+  "version": "0.0.1",
+  "homepage": "https://github.com/ded/bowser",
+  "author": "Dustin Diaz <@ded>",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/ded/bowser.git"
+  },
+  "main": "./bowser.js"
+}