Output a diff when multi-line resource parameters are unmatched
Output a diff when multi-line resource parameters are unmatched

Reuse the existing differ code in rspec-expectations to make it easier
for the user to determine how the actual value differs from the expected
one.  This will only include a diff when multi-line values are involved.

mcoolive/chefspec,sethvargo/chefspec,gsavage/chefspec,sethvargo/chefspec,gsavage/chefspec,chefspec/chefspec,lamont-granquist/chefspec,lamont-granquist/chefspec,chefspec/chefspec,mcoolive/chefspec