Multiple fixes to logging subsystem

  * Defaults.plist: don't hardcode the loglevel for
    WOHttpTransactionLoggerConfig, use default

  * Templates/WOxElemBuilder.m: don't setLogLevel on the defaultLogger
  * WOApplication.m: don't setLogLevel on the defaultLogger
  * WOHttpAdaptor/WORequestParser.m: don't setLogLevel on the defaultLogger

  * NSObject+Logs.m (debugWithFormat:arguments:): check current
    logLevel value before calling [NGLogger logLevel:message:]
    This squelches debug message at lower log levels
  * NGLogger.m (_logLevelForString): fix the check and return
    the defaultLogLevel instead of hardcoding INFO