Fix past standard_library hook test.

The test framework here calls remove_hook() from past, but the test
installs hooks from future, so they bleed through.
Merge pull request #66 from QuLogic/fix-standard_library-hook-test

Fix standard library hook test
Fix object.__format__ test on Python 3.4.

The test checks if this is deprecated, but in 3.4, the behaviour was
made an error.