Merge pull request #412 from scratchfoundation/jest

Switch to Jest and re-enable project tests

Author: cwillisf

jest.config.js

@@ -0,0 +1,5 @@
+module.exports = {
+    transform: {
+        '\\.(png|svg|wav)$': '<rootDir>/test/transformers/arraybuffer-loader.js'
+    }
+};