Issue when an error is raised in a Timecop.return block

[camertron]

Consider this example:

Timecop.travel(Time.now - (1 * 24 * 60 * 60)) do
  puts Time.now.to_s
  Timecop.return { puts Time.now.to_s; raise 'foo!' } rescue nil
  puts Time.now.to_s
end

Console output:

2014-09-10 14:05:55 -0700
2014-09-11 14:05:55 -0700
2014-09-11 14:05:55 -0700

Errors raised in a Timecop.return block mean the previous time is never restored, undoing any freezes or travels. This PR simply adds an ensure statement in Timecop#return that ensures the current stack always gets restored, even when an error occurs in the yield.

[camertron]

Any idea when this might be merged, @travisjeffery?

[travisjeffery]

Ah, nice! Thank you!