…r rewrite

Fix pytest-dev#1888

…hook

Fix issue pytest_plugins as string was marking wrong modules for rewrite

…tem_debugging

Conflicts:
	CHANGELOG.rst

plus small scale refactoring

…anups_for_post_mortem_debugging

unittest runner: avoid tearDown and cleanup to ease post mortem debugging

…plugin

Fix pytest-dev#1898

Release 3.0.2

Also, using "dev0" as development suffix otherwise distutils gives a warning during "setup.py develop":

UserWarning: Normalizing '3.0.3.dev' to '3.0.3.dev0'
  normalized_version,

…ease

Finalize 3.0.2 release