This is a blatent ripoff of caffeine. Luckily this has a retina and dark mode compatible icon.
Download the latest release here (it is not signed)
- Left click to keep your display awake indefinitely.
- Right click to quick or open ColdBrew at login.
- After toggling the menu a few times you have to right click the icon after the menu closes to unhighlight the status bar icon. I think this is a bug in Yosemite.