Oops,readd canvas

package.json

@@ -26,6 +26,7 @@
     "test": "istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage"
   },
   "dependencies": {
+    "canvas": "1.1.6",
     "forever": "^0.13.0",
     "jade": "~1.9.1",
     "lwip": "0.0.6",