Update Readme with installation instructions
Empty application indicator
Virtual Box icon
Merge pull request #3 from mycardboardbox/empty_indicator

Empty indicator
Fix readme formatting
Add update loop which executes ever 5 seconds
Function to return status of virtual machine
Start using callbacks
Add function to run system command and fail on error
Fix timeout loop and add function to return VM Status
Check for difference between old and new virtual machines status
Update installation instructions
Add menu item to exit application
Refacter code
Add comments to existing functions
Add function to create new menu item
Update newMenuItem to return Gtk::ImageMenuItem when appropriate
Refactor code and add comments to newMenuItem function
Add ability to use callbacks
Fix callbacks