test: create Mocha config file; remove unneeded "exit" option (#336)

Author: boneskull

.mocharc.json

@@ -0,0 +1,3 @@
+{
+  "require": "intelli-espower-loader"
+}

package.json

@@ -11,8 +11,8 @@
   },
   "scripts": {
     "test": "npm run test-unit && npm run lint",
-    "test-unit": "mocha --require intelli-espower-loader test/unit/*.test.js --exit",
-    "test-all": "mocha --require intelli-espower-loader test/**/*.test.js --exit",
+    "test-unit": "mocha test/unit/*.test.js",
+    "test-all": "mocha test/**/*.test.js",
     "coverage": "nyc --reporter=html --reporter=text --reporter=text-summary npm test",
     "coverage-all": "nyc --reporter=lcov --reporter=text --reporter=text-summary npm run test-all",
     "report-coverage": "nyc report --reporter=lcov > coverage.lcov && codecov",