Upgrade to 2.99/3.0 rspec by using Rspec.current_example

* @example was removed

* passing example to the block was hiding access to method example

* Use of example method was deprecated in favor of using
  Rspec.current_example
Change use of Rspec.current_example to support 2.14

* Following example from
  http://rdoc.info/github/rspec/rspec-core/RSpec.current_example
Merge pull request #7 from justin808/justin808-rspec-299

Upgrade to 2.99/3.0 rspec by using Rspec.current_example
Merge remote-tracking branch 'upstream/master'

Conflicts:
	lib/rspec/retry.rb