flipped TraceType Enum values

#39 @rustd 
MsBuild calls it LoggerVerbosity and they go low (quite) to high (diagnostic) based on the amount of info you get
http://referencesource.microsoft.com/#Microsoft.Build.Framework/Microsoft/Build/Framework/LoggerVerbosity.cs

Log4j uses 0 for off -> 7 for verbose 
http://svn.apache.org/viewvc/logging/log4j/trunk/src/main/java/org/apache/log4j/Level.java?view=markup