nixUnstable: Update to 1.7pre3327_0e2ca26

Also fixes disappeared tarball.
Stick titanium CLI to version 3.2.0, otherwise the latest beta version gets installed
Merge stdenv-updates into master

This is a re-merge, in fact. Now the first parent is master
as of right before the "first merge" (ac6761c9).
A few commits pushed in-between into master now look like coming
from stdenv-updates, but otherwise this seems to fix the situation.

Cf. https://github.com/NixOS/nixpkgs/commit/320209a618221728e022222a2aafee1af72037bb#commitcomment-5125991
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>
titaniumsdk: Replace deprecated python build tools by the new NodeJS based tool