Made npm test work on windows w/ mSysGit.

Also took away the path to grunt, npm sets it
(https://github.com/isaacs/npm/issues/2576),

package.json

@@ -23,7 +23,7 @@
         "ambers": "./bin/server"
     },
     "scripts": {
-        "test": "./node_modules/grunt/bin/grunt amberc:amber_test_runner; node ./test/amber_test_runner.js"
+        "test": "sh -c 'grunt amberc:amber_test_runner' && node ./test/amber_test_runner.js"
     },
     "devDependencies": {
         "pegjs": "~0.7.0",