add logging and refactor (#26)

js/memoryMonitor.js

@@ -0,0 +1,18 @@
+'use strict';
+
+const electron = require('electron');
+const log = require('./log.js');
+const logLevels = require('./enums/logLevels.js')
+
+// once a minute
+setInterval(gatherMemory, 1000 * 60);
+
+function gatherMemory() {
+    var memory = process.getProcessMemoryInfo();
+    var details =
+        'workingSetSize: ' + memory.workingSetSize +
+        ' peakWorkingSetSize: ' + memory.peakWorkingSetSize +
+        ' privatesBytes: ' + memory.privatesBytes +
+        ' sharedBytes: ' + memory.sharedBytes;
+    log.send(logLevels.INFO, details);
+}