Release alpha v.0.4.1

Few changes, but I hope you enjoy and test the giant map.

[h2]Features[/h2]

• Huge map
  
• New building: Heavy iron mine
  

[h2]Bugs[/h2]

• The << back button now works properly
  
• Fixed the issue when pausing and unpausing with space bar, it did not resume on the speed that you had before
  
• Parking lots no longer cause a loop of upgrading and downgrading
  
• Hotkeys to zoom in/out