Bring changelog up to date.
Skip NumPy test if NumPy is not available.
Make definition of  conditional on NumPy being installed; update skip message to match that used elsewhere
Merge pull request #157 from enthought/skip-numpy-test-if-numpy-not-available

Skip numpy test if numpy not available
Replace uses of deprecated TestCase.assert_ and TestCase.assertEquals methods.
FIX: Use unittest from the unittest_tools module.
Fix Python 2.6 syntax error in refactordoc Sphinx extension.
Merge pull request #159 from enthought/fix-refactordoc-syntax-error

Fix Python 2.6 syntax error in refactordoc Sphinx extension.
Fix typo.
Merge pull request #158 from enthought/avoid-deprecated-unittest-methods

Replace uses of deprecated TestCase.assert_ and TestCase.assertEquals methods.
Merge pull request #156 from enthought/bring-changelog-up-to-date

Bring changelog up to date.
Update copyright years; remove outdated reference to traits/protocols.
Add MANIFEST.in file to ensure that important text files are included in any source distribution.
Fix missing newline.
Fix a compiler warning.
Merge fixes from master.
Merge branch 'fix-compiler-warning' into release/4.5.0
Merge branch 'fix-license' into release/4.5.0