Please note that this is a dev build of Sublime Text 3. You can only get it by manually downloading or checking for updates using a dev build. The most recent stable build of ST3 is from December of 2013.[1]
Dev builds are alpha-quality and generally unsuitable for everyday use. The current build will change permissions on any file you save.[2]
1. http://www.sublimetext.com/3
2. http://www.sublimetext.com/forum/viewtopic.php?f=2&t=16696&s...