VirtualBox support
Merge pull request #27 from gavinandresen/virtualbox

Virtualbox support
Allow environment-configurable KVM binary name
Bugfix: git fetch directly from the remote URL, rather than only setting a default the first time

- Fixes problem where the gitian URL varies for different branches of the same repository
- Explicitly fetching tags using + allows repository to overwrite existing tags (changed tag)
- Fetching branch heads to local heads correctly makes branch names available for commit option
- Fetching both branches and tags at the same time optimizes things slightly
Update README to include Gentoo instructions as well
Merge pull request #30 from luke-jr/gentoo

Update README to include Gentoo instructions as well
Merge pull request #29 from luke-jr/bugfix_changing_remote_uri

Bugfix: git fetch directly from the remote URL, rather than only setting a default the first time
Merge pull request #28 from luke-jr/custom_kvm

Allow environment-configurable KVM binary name
Use qemu-system- instead of kvm -m

As kvm -m doesn't work in Ubuntu 13.04 anymore.
Merge pull request #31 from sipa/qemusystem

Use qemu-system- instead of kvm -m
Perhaps also actually enable KVM...
Merge pull request #32 from sipa/enablekvm

Perhaps also actually enable KVM...
Bugfix: Pass --update-head-ok to git fetch to avoid problems overwriting checked out branch
Bugfix: Use noninteractive frontend for apt-get
Don't install package recommends implicitly (require yml to specify them)
Merge pull request #33 from luke-jr/bugfix_update_head_ok

Bugfix: Pass --update-head-ok to git fetch to avoid problems overwriting checked out branch
Merge pull request #34 from luke-jr/bugfix_noninteractive

Bugfix: Use noninteractive frontend for apt-get
Merge pull request #35 from luke-jr/no_recommends

Don't install package recommends implicitly