Fixed HRToast+UIView.swift including current Swift code version

Hello!

Firstly, congratulations for the API, I really liked it. Actually I am using it in my project to display Toast and spinners and I have to say I feel really comfortable with it.

Concerning the code, I have just updated it according to the current Swift specification. It perfectly compiles for me and successfully displays the toasts without (apparently) any problem.

Best regards!
@MoliHoly
![screen shot 2014-09-29 at 05 17 09](https://cloud.githubusercontent.com/assets/2722756/4436927/1e7eb170-4787-11e4-839f-e6e015e48d33.png)