support rspec color codes
changelog for #1531
[skip ci]
Merge pull request #1531 from rspec/support_rspec_does_in_console_codes

Support RSpec color codes
Fix regression in progress/doc backtrace output.

In 2.x it had a `#` character at the start of each line.

The output fixtures were generated from 8f7c2f45edd78c28dcc8834fda31e0f5750fde04,
before Jon's recent formatter changes