Add block-matrix code as regression test
Merge branch 'master' into hpx/master
Check for std::initializer_list
Replace __builtin_unreachable() by assert(0)
Check for auto keyword and std::initializer_list instead of just requiring C++11
Add copyright statements to each block_matrix source file
Don't include <unistd.h>
Return report_errors()
Correct typo in std::initializer_list auto-detection
Add wrapper for report_errors()
Merge pull request #873 from eschnett/master

Add block-matrix code as regression test