Support OS X Yosemite / 10.10

[shelhamer]

CUDA 7 is at last compatible with libc++, so on OS X the installation will be much simpler since the libstdc++ workaround for NVCC compatibility will no longer be needed. Until then, compiling Caffe on OS X Yosemite almost just works, but this takes care of the details:

• pick libstdc++ for OS X (regardless of version)
• make gtest rely on its own tuple to not conflict with clang (I'm not sure this is necessary, but it seems to be needed sometimes and does no harm)
• 10.10 has Accelerate while 10.9 has vecLib for BLAS

Thanks to @leonardt @drdan14 @pluskid scottsievert and others for reporting these issues with fixes.

Note: this PR is to dev because a release will be made soon.

[shelhamer]

This still suffers from the PowerGradient test failures #1252 with boost 1.57 (regardless of the BLAS choice).

[pannous]

Yay, works, but Makefile gets overwritten if people foolishly call cmake

[pannous]

Until then, compiling Caffe on OS X Yosemite almost just works, but this takes care of the details: pick libstdc++ ...

This should probably be mentioned/referenced/clarified here:
http://caffe.berkeleyvision.org/installation.html

[shelhamer]

Yes -- the installation docs will be overhauled in the next release with a
special section on the CUDA / libc++ situation on Yosemite.
On Wed, Feb 4, 2015 at 03:42 pannous notifications@github.com wrote:

Until then, compiling Caffe on OS X Yosemite almost just works, but
this takes care of the details: pick libstdc++ ...

This should probably be mentioned/referenced/clarified here:
http://caffe.berkeleyvision.org/installation.html

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#1740 (comment).

[shelhamer]

33a56e0 adds the Makefile condition for Yosemite and CUDA 7 to agree on libc++ so OS X 10.10 users should not switch dependencies to libstdc++.