Merge pull request #374 from jonasman/master

fixed a compiler warning and make the interface compliant to the implementation
Upgraded CocoaLumberjack to version 1.8.1
Xcode Projects update to Support CocoaLumberjack 1.8.1
Added a stored, thread safe NSDateFormatter instead of creating a new date formatter everytime one is needed
SCRAM-SHA1: Normalize password with resourceprep profile
SCRAM-SHA-1: finally choose SASLprep profile
Merge pull request #378 from vitalyster/scramfix

SCRAM-SHA-1 implementation using wrong stringprep profile when normalizing passwords