Ruby 2.0 fixes

There's a couple of small fixes in this pull request:

* `respond_to?` no longer returns true for protected methods in Ruby 2.0
* the regex you're using on "Ruby version" needs updating for Ruby 2.0
* fixed the stubs of `Time.now` to actually return a Time object (no idea why this worked before, but it failed hard for me so I fixed it)

cheers