vdiffr 0.3.2

• Fixed CRAN checks on r-devel.

• Keyboard short cuts for common interactions:
  Right/Left arrows = Next/Previous case
  Down/Up arrows = Next/Previous type
  ENTER = Validate active case
  shift + ENTER = Validate active group
  ESC = Quit app

• Failure diffs are now logged in vdiffr.Rout.fail when the CI
  environment variable is set. This makes it easier to investigate
  remote failures on Travis etc (#79).