Read log level from configuration and update readme

- Break out reading of settings in js and remove it from shell scripts
- Pick up config from Logger via Configuration class

plejd/Configuration.js

@@ -0,0 +1,15 @@
+const fs = require('fs');
+
+class Configuration {
+    static _config = null;
+    
+    static getConfiguration() {
+        if (!Configuration._config) {
+            const rawData = fs.readFileSync('/data/options.json');          
+            Configuration._config = JSON.parse(rawData);
+        } 
+        return Configuration._config;
+    }
+}
+
+module.exports = Configuration;