Fix error with gcc -Wformat -Werror=format-security

BUG=http://code.google.com/p/ibus/issues/detail?id=1638
TEST=src/ibusfactory.c

Review URL: https://codereview.appspot.com/11503043
Patch from Peter Michael Green <plugwash@debian.org>.
Fix error with gcc -Wformat -Werror=format-security

BUG=http://code.google.com/p/ibus/issues/detail?id=1638
TEST=bus/ibusimpl.c

Review URL: https://codereview.appspot.com/11471044
Patch from Osamu Aoki <osamu@debian.org>.
Remove arrow buttons in ibus-setup, which no longer work.

BUG=RH#851758
TEST=ibus-setup

Review URL: https://codereview.appspot.com/6475068