Update README to only mention GTK+ 3
Add only numeric characters to TPOS in ID3 Tags

https://bugzilla.gnome.org/show_bug.cgi?id=726467
Fix compilation if TagLib is not available

Thanks to Abhinav for the report.
Correct buffer type in C++ GIO wrapper
Updated Hungarian translation
Updated Lithuanian translation
Drop sizeof when using G_N_ELEMENTS

The refactorization left extraneous sizeof when changing to
G_N_ELEMENTS.
Fix C++ ID3 wrapper compilation

https://bugzilla.gnome.org/show_bug.cgi?id=728113
Updated Brazilian Portuguese translation
Updated Spanish translation
Document libid3tag requirement in README
Port from GApplication to GtkApplication
Move main window to EtApplicationWindow object
Pass the main window to actions as user data
Move log area to EtLogArea object
Move playlist window to EtPlaylistDialog object
Move load filenames dialog to EtLoadFilesDialog
Move file search dialog to EtSearchDialog object
Move preferences dialog to EtPreferencesDialog
Move CDDB dialog to EtCDDBDialog object