Merge remote-tracking branch 'upstream/master' into HEAD
drwxr-xr-x - .github
-rw-r--r-- 146 .gitignore
-rw-r--r-- 4669 AUTHORS
-rw-r--r-- 35821 Copying.txt
-rw-r--r-- 15796 README.md
-rw-r--r-- 10989 Top CPU Contributors.txt
-rw-r--r-- 3007 appveyor.yml
drwxr-xr-x - src
drwxr-xr-x - tests