Fix PyPy test failures due to missing newline
`
Skip test_python_dash_v_as_python_bin on PyPy

-v option doesn't work with pypy
Add magic to safeeval to disable open on PyPy
Fix test_ssh_cat failure in PyPy

Call rstrip on output and compare to string without trailing newline

PyPy strings often seem to be missing a trailing newline that CPython
strings have.
.travis.yml: Test on pypy but allow failure
Make test_find_python_traceback pass on PyPy
Merge pull request #897 from msabramo/fix_pypy_test_failures

Fix all but one PyPy test failure