Buildlog-lint: move to build-log.rb, more tools to be added later
web interface: /patch now takes optional m(aintainer) parameter
Handle empty strings in a more reliable way. Fix: FetchGit updater becomes less greedy.
package updater: factor out version handling code into a sepearate function
Port GitHub updater to new API which lets it return multiple updated versions.
Properly handle meta.repositories.git in DistroPackage::Nix
Add MetaGit updater which handles meta.repositories.git