Customize TWMessageView numerics

[ValentinKuznetsov]

Greetings,

It would be great if there exists a possibility to customize these numerics:

(lines 17-19 in TWMessageBarManager.m)

CGFloat const kTWMessageViewBarPadding = 10.0f;
CGFloat const kTWMessageViewIconSize = 36.0f;
CGFloat const kTWMessageViewTextOffset = 2.0f;

Real life example: kTWMessageViewBarPadding is too big; value of 5 looks much better in my case. Of course I can fork it and change it myself, but let me not explain why it is not that nice:)

Thank you! Great control so far.