Making Bandit into an installable package and adding tox tests

This large change makes bandit into an installable packahge, needed
for tox testing. I have added the tox testing scaffolding but no
real tests, they will come in a later change. I have also disabled
all failing PEP8 test (lots) since I have changed enough stuff for
one patch. I'll start re-enabling and fixing PEP8 stuff soon.

Change-Id: I774ed9149f285e4e2bceacda0484a7e2a934a3aa