chore: add "unit", "wunit" and "funit" aliases (#859)

These are faster to type on the split keyboard :-[

package.json

@@ -16,6 +16,9 @@
     "ctest": "cross-env BROWSER=chromium node test/test.js",
     "ftest": "cross-env BROWSER=firefox node test/test.js",
     "wtest": "cross-env BROWSER=webkit node test/test.js",
+    "unit": "npm run ctest",
+    "wunit": "npm run ftest",
+    "funit": "npm run wtest",
     "debug-test": "node --inspect-brk test/test.js",
     "test-doclint": "node utils/doclint/check_public_api/test/test.js && node utils/doclint/preprocessor/test.js",
     "test": "npm run lint --silent && npm run coverage && npm run test-doclint && node utils/testrunner/test/test.js",