Requires adding a cpp-suppress

Sets the deployment target to 10.9 when compiling on version 10.9 and above.
The fix is taken from https://github.com/pandas-dev/pandas/pull/24274/files

GB: removed whitespace change and merged. Closes #445

Thanks @valsson

I removed the newline at the end of the string

there should be a function called test(), otherwise nose just imports
the modules and thinks no test was done

This add some incompatibility with all former implementations but is far easier to use

cc: @tetsuyamorishita

Plumedbot pull request

This commit contains changes automatically generated by plumedbot on Travis-ci.

This commit contains changes automatically generated by plumedbot on Travis-ci.

Thanks @valsson

(@gtribello noticed this is #423)

Closes #426