Pythonictestcase

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- export 'SkipTest' class via unittest (Python 2.7+), unittest2 or
nose.plugins.skip
- support for "expect_failure" decorator. It works very similar to unittest's
"expectedFailure". However failing tests are reported as "skipped" not
"passing" if the test runner does not support "expected failures" (such as
nosetests 1.x).

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- rename project to "PythonicTestcase" to workaround pip's automatic
replacement of underscores with dashes. This simplifies installation
from a private index.

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- fix: assert_raises does not catch some (expected) exceptions on Python 2.6

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- implement assert_not_raises

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- assert_raises can return a context manager

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- fix sdist by including Changelog.txt