Force the newest yapsy version (pip 1.4 again?)

This is required for Python 3.  If we don’t specify the version, 1.9.2 for
Python 2 is installed (the newest version is 1.10.2-pythons2n3 and pip 1.4
dislikes versions with dashes in them)

Signed-off-by: Kwpolska <kwpolska@gmail.com>
Merge branch 'yapsy-version-fix'

This is merged under the assumption that nothing will break.  The tests passed
for this commit.