execProg2, DeleteTask and IncrementVersionTask

Now delete task can receive an string or array of paths.
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execProg2 in utils.py module now can receive encoding.
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incrementversiontask.py now can use the svnRevision, by default the useSvnBuild is True, to use just add in the final of the calling: 
IncrementVersionTask(assemblyPath, type, projectRoot='\<put the project root path that have the svn\>')