Added the script tests/test_all.py.
Added the script tests/test_all.py.

git-svn-id: 6e6564d5ce6810ef0b7cb8f2d1f00fa8fbbe4f52@291 18f92427-320e-0410-9341-c67f048884a3

Stibbons/pyyaml,Stibbons/pyyaml,ravenac95/PyYAML,ravenac95/PyYAML,ingydotnet/pyyaml-mirror,ravenac95/simpleyaml