Correcting info for using with rspec-rails gem

Running rspec directly doesn't work to get the GENERATE_REPORTS support, but adding the new task definition and specifying it works great.
Only test with RSpec 2 style failures
Remove RSpec 1.x formatter methods
Remove RSpec 1.x failure wrapper
Remove RSpec 1.x requires
Merge pull request #121 from shepmaster/remove-rspec1

Remove RSpec 1.x support
Merge pull request #120 from nickveys/patch-1

Correcting info for using with rspec-rails gem