Merge pull request #136 from Kaworru/master

Add basic package.json for npm support.

package.json

+{
+  "name": "blockly-src",
+  "version": "1.0.0",
+  "description": "Blockly is a library for building visual programming editors.",
+  "keywords": ["blockly"],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/google/blockly.git"
+  },
+  "bugs": {
+    "url": "https://github.com/google/blockly/issues"
+  },
+  "homepage": "https://developers.google.com/blockly/",
+  "author": {
+    "name": "Neil Fraser"
+  },
+  "license": "Apache-2.0",
+  "private": true
+}