add gnome3.libgdata and liboauth
evolution-data-server: upgrade and move to gnome3 namespace
Add mailpile: A modern, fast web-mail client with user-friendly encryption and privacy features
enable gobjectintrospection for some libs
gnome3.libgdata: remove unneeded dep
gnome3.mutter: add optional deps
gnome3: remove librsvg with gtk2
gcc-4.8: Enable Darwin and FreeBSD
Fix tarball

Hopefully this kind of thing won't be needed with nix 1.7

Signed-off-by: Shea Levy <shea@shealevy.com>