portage: add media-gfx/mozjpeg and net-misc/wrk
portage: emacs use flags cleanup
Merge branch 'h6-gentoo' into h3-gentoo
Update grub and portage.

Update grub.
Portage: add keywords for vagrant, git extras, mruby, pidgin
and seafile; add use flags for seafile.
Merge branch 'h3-gentoo' into h6-gentoo

Conflicts:
	portage/package.use