updated pretty printer stack trace to use error

[FireAndIceFrog]

Pretty Printer:

When passing a stack trace to Log.d it obeys the errorMethodCount instead of the methodCount when cutting the size of the stack trace.

This is not ideal because I might just want to pass in an arbitrary stack trace without making it error.

Solution:

Make the stack trace sliced via either the methodCount or errorMethodCount depending on whether the error is defined (not null)

[neiljaywarner]

This seems like a good idea to me.