Clarifying documentation for -filterPredicate

The summary comment and discussion comment seem to indicate opposite behaviors. The implementation seems to support the discussion behavior.

This commit re-words the summary comment to clarify the -filterPredicate behavior.
Merge pull request #17 from rcarlsen/patch-1

Clarifying documentation for -filterPredicate
added AFLoggerLevelDebugCurl logger level
uses FormatterKit
fixes mistypes