Debug mode for better error debugging

[ghost]

I added two new properties on ayepromise, debugMode and suppressedErros.

When debugMode is on, all thrown errors catched inside promises (resulting on rejection) will be logged on the console window and added to the suppressedErros array.

[cburgmer]

Hi, thanks for sharing.

I'd like to keep the library as small as possible. Most modules in npm try to do one thing, and do it well. I've tried to move your code into a independent module, that wraps itself around ayepromise: https://gist.github.com/cburgmer/849e1d0eff709bd02c10

Let me know, if that works for you. We could document this solution in an example directory along side the code. What do you think?