Add middleware to check for the appropriate Node version

- Add middleware to check for the appropriate Node version. This relies on the
engines.node flag being set on package.json.

src/libs/middlewares/checkVersion.js

+const curPath = process.cwd();
+const libs = `${process.cwd()}/libs`;
+const log = require(`${libs}/log`)(module);
+const chalk = require('chalk');
+const packageConf = require(`${curPath}/package.json`);
+
+module.exports = () => {
+    // Parse version number from strings such as 'v4.2.0' or `>=4.0.0'
+    function parseVersionNumber(versionString) {
+        return parseFloat(versionString.replace(/[^\d\.]/g, ''));
+    }
+    // Ensure minimum supported node version is used
+    const minNodeVersion = parseVersionNumber(packageConf.engines.node);
+    const currentNodeVersion = parseVersionNumber(process.version);
+    if (minNodeVersion > currentNodeVersion) {
+        log.error(chalk.red(`You must upgrade node to >=${minNodeVersion}.x to use simcaq-node!`));
+        return false;
+    } else {
+        log.info('Node version should work!');
+        return true;
+    }
+};