Ensure that the main copy of ah_bootstrap.py is always used, and that we are returned to the cwd at the end of a test that uses the testpackage fixture
Ensure that the main copy of ah_bootstrap.py is always used, and that we are returned to the cwd at the end of a test that uses the testpackage fixture

bsipocz/astropy-helpers,embray/astropy_helpers,larrybradley/astropy-helpers,astropy/astropy-helpers,bsipocz/astropy-helpers,larrybradley/astropy-helpers,embray/astropy_helpers,Cadair/astropy-helpers,larrybradley/astropy-helpers,bsipocz/astropy-helpers,Cadair/astropy-helpers,dpshelio/astropy-helpers,astropy/astropy-helpers,dpshelio/astropy-helpers,embray/astropy_helpers,embray/astropy_helpers