Use DrawerLayer to show a side drawer with parts of the loaded
document. The dawer consists of an image (could be changed by a
thumbnail in the future) and the part name.
Change-Id: I27fb6112d9f11e19f3295ace97103b89816591aa
LOAndroid3 is based of LibreOffice4Android project which uses
ant/make for building. By using LibreOffice4Android as the base,
the project creates a APK archive which has all needed files
to start LibreOffice in Android environment.
Change-Id: I697d5f727bdaf93e774144ad597d7081d2609908