python - ex: Add license, replace license-stamps with IRIs.

Log Message:
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Add license, replace license-stamps with IRIs.

Modified Files:
--------------
ex:
setup.py (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ex/setup.py.diff?r1=1.3&r2=1.4)
ex/src:
code.py (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ex/src/code.py.diff?r1=1.2&r2=1.3)
prime.py (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ex/src/prime.py.diff?r1=1.3&r2=1.4)

Added Files:
-----------
ex:
LICENSE (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/ex/LICENSE?rev=1.1&content-type=text/x-cvsweb-markup)