test_coverage_plugin.py: skip the tests when coverage is not available
Merge pull request #597 from mitya57/dont-fail-on-missing-coverage

test_coverage_plugin.py: raise SkipTest when coverage cannot be imported
Fixed #513. nose/failure.py now correctly re-raises exception
if exc_val is already a BaseException
Issue #535: fix nose.importer to work when the same modules are reachable from different paths along sys.path, due to e.g. symlinks.
(note: not sure this will work under Windows, this may need further tweaking)
Add a test case for previous commit
Fix tests under py32 by creating the symlink dynamically (it didn't get copied into build/tests).
Also, try to make things work under Windows (but untested).
Replace abspath() with realpath(), and remove redundant call to normpath()
Merge pull request #601 from pitrou/issue535

Issue #535: fix nose.importer to work when the same modules are reachabl...
test_failure.py: make the test a bit more strict (fix by @jszakmeister)
Merge pull request #598 from mitya57/master

Fixed #513: exception in test generator leads to a TypeError.