title: adb command doesn't list my device
body: <p>On a Macbook Pro with Yosemite -
  After getting through the difficulties of getting Android SDK installed, I plug in the device, but it doesn't show. The command adb devices yields "List of devices attached" with nothing following. It's there on the USB, the About This Mac System Report shows it present on the USB.</p>
  
  <p>This question looks similar to <a href="https://stackoverflow.com/questions/27592739/issue-setting-up-the-development-environment-for-projecttango-developemnt-device">Issue setting up the development environment for ProjectTango developemnt Device</a> but is not the same because I'm not using Eclipse.</p>