operator<< for exceptions, testsuite for exceptions

[Onno Kortmann]

Hello,

here is a patch that will enrich the interface of Exception a little bit. It 
adds an << - operator. And there is now a little testsuite for the exception 
class.
Oh, and this updates tests/README. It was a bit out of date.
...and I'm not a native english speaker, so please correct it...

The patch that adds the operator is commoncpp-exception-stream.diff,
the patch that modifies the Makefile/README in tests/ is 
commoncpp-exception-test.diff and the two files Test_Exception.h/.cpp are the 
new test for the "Exception" class.

Regards,

Onno

PS. If this all is crap, please let me know :)

commoncpp-exception-test.diff
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commoncpp-exception-stream.diff
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Test_Exception.cpp
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Test_Exception.h
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