#8 truncated error message

[dglover]

When running SUTV it only shows the first line of an error message.
SUT Validator version 1.11
Error performing pre-validation transformation: Warning:

I think this is because there is a Warning message followed by an error.
Fix this by improving the code in TransformerFacade.java function determineErrorMessaage. This function needs to read all the lines accumulated into the temp file rather than just returning the first line.