Commits on Nov 6, 2017

1. Add a number of progress indicators to Cargo …

   This commit is an attempt to stem the tide of "cargo is stuck updating the
   registry" issues by giving a better indication as to what's happening in
   long-running steps. The primary addition here is a `Progress` helper module
   which prints and manages a progress bar for long-running operations like git
   fetches, git checkouts, HTTP downloads, etc.
   
   The second addition here is to print out when we've been stuck in resolve for
   some time. We never really have a progress indicator for crate graph resolution
   nor do we know when we're done updating sources. Instead we make a naive
   assumption that when you've spent 0.5s in the resolution loop itself (not
   updating deps) you're probably done updating dependencies and on to acutal
   resolution. This will print out `Resolving crate graph...` and help inform that
   Cargo is indeed not stuck looking at the registry, but rather it's churning away
   in resolution.

   

   alexcrichton committed Nov 6, 2017
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