Use C++11 std and stdlib on OS X >=10.9, C++03 on <=10.8

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Fix duplicate test targets, fix 'make tests'
Merge pull request #209 from tribal-tec/master

Fix duplicate test targets, fix 'make tests'
Merge pull request #208 from rdumusc/master

Fixed PackageConfig.cmake.
Add test macro printing result of a failed operation
Merge pull request #210 from eile/master

C++03/11 apple fix, test macro
'make update' now also updates the external git repository.