Add Custom Widget for LibreBook

With the Java-Gnome bindings, it's not possible to develop custom GTK widget in pure Java. But we need to add custom widget in librebook for a great look, the solution is to develop these widgets in C and create bindings like all components in the Java-Gnome library.

The Main Screen for LibreBook

Develop the main screen for LibreBook. The main screen is a copy of the Rhyhtmbox interface but for eBook instead of Music. These features will be included in the first version of LibreBook : - Add new books - Show books in the library - Scan bookeen library - Search in the library