Commits on Mar 31, 2017

1. Fix fatal git failures in tests …

   The tests had started printing git error messages:
   
   ```
   fatal: ambiguous argument 'HEAD': unknown revision or path not in the working tree.
   ```
   
   These were coming from three places:
   
   - `suspenders.gemspec`, which collects all `Gem::Specification#files=`
     by shelling out to `git ls-files`.
   - `suspenders.gemspec`, which collects all
     `Gem::Specification#test_files=` by shelling out to
     `git ls-files -- {test,spec,features}/*`.
   - Honeybadger, which figures out which revision to tag the error with by
     invoking `rev-parse`:
   
         def from_git
           return nil unless File.directory?('.git')
           `git rev-parse HEAD`.strip rescue nil
         end
   
   Although I am unsure why these things started to matter now, I found two
   changes that improve the situation:
   
   - In the test suite, make an initial commit after suspender'ing a
     project.
   - When suspender'ing a project, make the git repo last.

   

   mike-burns committed Mar 31, 2017
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