Grep bug fix (#456)

* fixed the bug for pypy-5.8.0

* changelog entry

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* use std-lib sub-env

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* let's see if this cleans things up

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* try v7 of stdlib

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* use new sub_env

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* set_env

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* set_default_env

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* v8 of stdlib

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* v112

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* oops (merge bug)

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* final merge error resolve

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* final final fix for merge conflict

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>