Cached builds

Source units now point to their previous revision if the unit isn't changed, and those units aren't rebuilt during the `make` step.
Oh. If it's intentional it's fine. I just thought you had unintentionally done it. 

Sent from my iPhone

> On Dec 31, 2014, at 19:01, Samer Masterson <notifications@github.com> wrote:
> 
> In src/repo_config.go:
> 
> > @@ -95,6 +95,32 @@ func resolveWorkingTreeRevision(vcsType string, dir string) (string, error) {
> >  	return strings.TrimSuffix(string(bytes.TrimSpace(out)), "+"), nil
> >  }
> >  
> > +func listRevisions(vcsType string, dir string) ([]string, error) {
> Haha, I had read something about Rob Pike (pbuh) preferring `(arg0 type0, arg1 type0)` to `(arg0, arg1 type0)` because of how it looks in godoc, but the standard library has many more examples of the latter :) Quinn Slack writes:
> …
> —
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