Merging in patch from Issue #388 to add support for real thread ID on OS X.
Merging in patch from Issue #388 to add support for real thread ID on OS X.

shiva21/psutil,chjwang/psutil,stupidcache/psutil,djhaskin987/psutil,google-code-export/psutil,vmolsa/psutil,vmolsa/psutil,marmolu/psutil,tigerneil/psutil,google-code-export/psutil,huson2012/psutil,PFZheng/psutil,skyshe/psutil,skyshe/psutil,PFZheng/psutil,tigerneil/psutil,skyshe/psutil,huson2012/psutil,creativewild/psutil,stupidcache/psutil,anfedorov/psutil,jucapj/psutil,marmolu/psutil,Alwnikrotikz/psutil,chjwang/psutil,kiranvizru/psutil,huson2012/psutil,google-code-export/psutil,djhaskin987/psutil,tigerneil/psutil,AlanZatarain/psutil,end18/psutil,vmolsa/psutil,AlanZatarain/psutil,end18/psutil,tigerneil/psutil,anfedorov/psutil,creativewild/psutil,end18/psutil,creativewild/psutil,zhengzheng/psutil,djhaskin987/psutil,djhaskin987/psutil,peter-hst/psutil,skyshe/psutil,zhengzheng/psutil,jucapj/psutil,google-code-export/psutil,nmani1905/psutil,kiranvizru/psutil,end18/psutil,stupidcache/psutil,kiranvizru/psutil,vmolsa/psutil,peter-hst/psutil,kiranvizru/psutil,shiva21/psutil,Alwnikrotikz/psutil,nmani1905/psutil