3.0.0-alpha100

Allow to reference git repositories - http://fsprojects.github.io/Paket/git-dependencies.html
Allow to run build commands on git repositories - http://fsprojects.github.io/Paket/git-dependencies.html#Running-a-build-in-git-repositories
Allow to use git repositories as NuGet source - http://fsprojects.github.io/Paket/git-dependencies.html#Using-Git-repositories-as-NuGet-source
Additional local caches - http://fsprojects.github.io/Paket/caches.html
Garbage collection in packages folder - #1491
Allows to exclude dll references from a NuGet package - http://fsprojects.github.io/Paket/references-files.html#Excluding-libraries
BREAKING CHANGE: Removed --hard parameter from all commands. Paket threads all commands as if --hard would have been set - #1567