Bump cmake-unit version.

assert_file_exists and assert_file_does_not_exist actually asserted on
the opposite due to a bug in cmake-unit, and because of this bug our
tests were passing on data that was actually incorrect. Fixed the tests to put
the vera++ data in the right place.
Merge pull request #23 from smspillaz/common-universal-cmake.item_22

Bump cmake-unit version