This adds a new git fetcher. In doing so, it also refactors how the
fetchers work a bit to better support fetchers that need to resolve
user-provided sources to fully specified sources appropriate for a
lockfile.
Signed-off-by: Steven Danna <steve@chef.io>
This adds a basic prototype of inspec.lock. When the lockfile exists on
disk, the dependencies tree is constructed using the information in the
lock file rather than using the resolver.
Signed-off-by: Steven Danna <steve@chef.io>
