vagrant: 1.9.5 -> 2.0.0
vagrant: 1.9.5 -> 2.0.0

Upgrade to latest version of Vagrant.

After installation, the following messages appear whenever vagrant runs.
These were already present in previous versions, I'm not sure if/what
to do about them:

Ignoring ffi-1.9.18 because its extensions are not built.  Try: gem pristine ffi --version 1.9.18
Ignoring unf_ext-0.0.7.4 because its extensions are not built.  Try: gem pristine unf_ext --version 0.0.7.4
Ignoring wdm-0.1.1 because its extensions are not built.  Try: gem pristine wdm --version 0.1.1

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs