Add configure --with-python option

It could be used to select python2 or python3
Update .gitignore

Remove obsolete setup/hangul_keyboard_list
setup: Remove unused $(pkglibdir)

$(pkgdatadir)/setup/config.py had Arch-dependent $(pkglibdir) path.

See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=768061
Merge pull request #28 from changwoo/python3

Add configure --with-python option