switched nedb to nedb-promises (#37)

* breaking change: switched to nedb-promises
* Linting
* some dev dependencies
* more tests
* updated package version
* bug fixing
* changed isNaN to isString
* (fix) args[0]

functions/CreateResultTable.js

@@ -1,3 +1,7 @@
+function f(n) {
+    return (n > 0 ? '+' : '') + n;
+}
+
 const CreateResultTable = ({
     Attributes: Attributes,
     Throws: Throws,
@@ -21,8 +25,4 @@ const CreateResultTable = ({
 	`;
 };
 
-const f = n => {
-    return (n > 0 ? '+' : '') + n;
-};
-
 module.exports = { CreateResultTable, f };