ATS2 version [0.0.7] --> [0.1.0]
rust: Prepare for more versions part 1:
 - Factor out some things that REALLY shouldn't change between versions
rust: Prepare for more versions part 2:
 - Default is now an alias for 0.11
scummvm: version bump to 1.7
rust: Add hashes for i686-darwin
thunderbird-bin: Update to version 31.0.
Ansible: updated to 1.6.10
rust: Add an alternative package for the master tip

based off of pull request #3084
Merge pull request #3415 from bodil/master

thunderbird-bin: Update to version 31.0.
Merge pull request #3417 from madjar/master

Ansible: updated to 1.6.10
Merge pull request #3409 from FlashKorten/scummvm_1.7

scummvm: version bump to 1.7
rust: Refer to 0.11.nix directly in all-packages
rather than use default.nix indirection
Merge pull request #3395 from mixis/master

ATS2 version [0.0.7] --> [0.1.0]
rustc: rename rust to rustc, but keep rust attr name for backwards compat
Merge pull request #3412 from Ericson2314/rust-master

Add alternative rustc package for master tip