Merge branch 'release-0.2.2'
Merge commit '39319ceeacd6320cdf8c701854f78bf976acea67'
Apply patch to ax_cxx_compile_stdcxx_11 so that C++11 support is
correctly identified on Mac OS 10.8.
Bumped version to 0.3.1.
Bumped version to 0.4.0.
Merge branch 'release-0.4.0'
Merge branch 'master' into develop