Invalid StackName if target contains space

[PGLongo]

If the target contains space the model is automatically named with '_' instead of ' ', for example 'Pokemon Ruby Omega' became 'Pokemon_Ruby_Omega'

let stackName = (infoDictionary!["CFBundleName"] as NSString

We could change stackName like this

let stackName = (infoDictionary!["CFBundleName"] as NSString).stringByReplacingOccurrencesOfString(" ", withString: "_")

Maybe we can also change NSString to String.

[PGLongo]

Maybe you can fix in #22

[michaelarmstrong]

I can confirm this will indeed be fixed in #22