Hangs when running from Tmux on OS X 10.10 Yosemite

[e9t]

The same issue as in julienXX/terminal-notifier#115.

[e9t]

This isn't a nice solution so I won't make a pull request, but those who would like a quick n dirty fix can just brew install reattach-to-user-namespace, then prepend reattach-to-user-namespace as in this commit: e9t@5fa3972.

[maxkrivich]

@e9t it's still the valid issue?