about; update date

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
libgpaste-applet: mark application allow-none

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
libgpaste-applet: don't close on delete

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
Merge branch 'gpaste-3.10'

* gpaste-3.10:
  libgpaste-applet: don't close on delete
  libgpaste-applet: mark application allow-none
  about; update date

Conflicts:
	TODO