Simple cocoa app for goagent on Mac OS X

I want to do my bit for the project which helps me a lot, though I'm new to cocoa development.

This app just contains basic functions at the moment, still I think, it will provides a convenient for those who are not experienced in terminal commands.

**goagent-osx.app should be located in the folder of `goagent/local`.**

![capture_20140926034650 2x](https://cloud.githubusercontent.com/assets/2188512/4411389/374957aa-44ee-11e4-8c1e-9090d2d79358.png)