Fix for detecting OpenCL on OS X.
Changing the Boost.Chrono macro to test for a function
that VexCL uses. thread_clock was giving me trouble on the
Mac (not sure why, Google hasn't been helpful), and since
we aren't using that, just seemed easier to do this.
Oops, forgot this part of the OpenCL for Mac fix.
Turn off test until Sylvain adds the actual source file.
Can't use 1.0L etc. with VexCL vectors. make check working agian.
Use Antioch::constant_clone in TroeFalloff

This should fix #8
Merge pull request #9 from ddemidov/issue_8

Use Antioch::constant_clone in TroeFalloff
Forgotten test