[Halo] Fix function mocking to not throw error if backup exists

Review Request #293 — Created April 17, 2014 and submitted — Latest diff uploaded

Information
pprkut
Lunr
master
Reviewers
lunr 
If a test fails that created a function mock, it doesn't unmock it. So rather than fail on a subsequent test as well, check whether the backup still exists and use that instead of trying to create it again.
Example tests

Diff Revision 1 (Latest)

src/Lunr/Halo/LunrBaseTest.php
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