daemon: add ShowHistory method

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
client: add ShowHistory method

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
gpaste: add show-history

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
gpaste: add show-history

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>