iOS client: add LoggerStartForBuildUser() macro to start the default logger with the name of the user building the project. This name is set in the build settings, by CocoaPods.
Update the README to explain how to install NSLogger using CocoaPods. And how to use the automatic Bonjour service naming (named after the user name).
Create a new NSLogger.h header file to allow the user to quickly and efficiently start using NSLogger.
Fix a minor warning.
Merge pull request #133 from atelierdumobile/master

iOS client: add LoggerStartForBuildUser() and LoggerXxxx() macros to ease the integration of NSLogger.