Feature/background and predefined title

[rsrbk]

• Added property predefinedText for setting up the text for the field.
• Added property isBackgroundBlurred, if true - it'll show the blur background below the alert.
  

[eriadam]

Hello Ruslan,

Thanks for this, I like these features a lot. Adding a placeholder was a bit cumbersome, this solves the issue. The blur background is a great idea as well.

Could you please have a look and rebase your changes at the 1.3.0 branch, I already addressed the Swift 3 things. I will have a look at the new open/public thing, it makes sense to add 'open' to a few places.

• Can you please stick to the 2 space indent?
• Would you please rename the "predefinedText" to "placeholder" as it is a UITextField after all.
• And kindly update the readme.md file with the new features.

Thanks again,
Adam

[eriadam]

@rsrbk Are you planning to continue with this?

[rsrbk]

@eriadam oh, sorry about that, I forgot. Will do it today!