Sublime populates its Tools/Build System menu based on the .sublime-build files stored in the Sublime Packages directory. To install yeoman.sublime-build, simply place this file within this directory.
Should one need to locate this path, it can be found in
- Ubuntu :
~/.config/sublime-text-2/Packages/User/ - OS X :
~/Library/Application Support/Sublime Text 2/Packages/User
or the corresponding Packages/User directory on other platforms.