Database revolution

- added in fitbitData an interface for keeping track of date
- removed annoying IOException, now will write a LOG
- same thing in sensor
- fixed main and adapted to new Database system
- Database now has Local or Remote (to implement)

src/main/java/device/fitbitdata/FitbitData.java

@@ -0,0 +1,8 @@
+package device.fitbitdata;
+
+public abstract class FitbitData {
+    private long millisec = 0;
+
+    public void setDate(long millisec) { this.millisec = millisec; }
+    public long getDate() { return this.millisec; }
+}