added: DeviceActivity,DeviceListFragment, DeviceInfoFragment
update: Panel implements Parcelable
added CREATOR for Panel
update: intent.putParcelableArrayListExtra to pass panel arraylist to
next activity.
updated: LoadingScreenActivity

1 load panels when activity onCreate()

2 put panelList in the intent and pass to next activity;

3 changes to  PanelListFragment and PanelActivity
updated: images to .png and transparent background
update: panel gtinArray to store GTIN intages in an array so it can be
passed via Parcel