Updated cocoapods spec
DDFileLogger: fixed crash that occured in case if application name == nil
DDFileLogger: fixed comment
Merge pull request #199 from dvor/ddfilelogger--fixing-comment

DDFileLogger: fixed comment
DDFileLogger: wrapping appName for logs in dispatch_once function
Merge pull request #198 from dvor/ddfilelogger-fixing-crash

DDFileLogger: fixed crash that occured in case if application name == nil