Fix for rspec ignore test failure
Fix for rspec ignore test failure

* The new Listen API ignore paths do not seem to work with symlinks.
This causes the watcher_spec ignore test to fail because it is using
Dir.tmpdir which returns a symlink (/var -> /private/var)--at least on
MacOS.
* To fix this issue, forcibly replace the return value of Dir.tmpdir
BEFORE initializing Watcher.

ktaragorn/rerun,philoserf/rerun