split nvp_driver and optimize_nvp_driver classes

[jmeridth]

• split nvp_driver and optimize_nvp_driver classes

  NB: you need to edit your quantum.conf file like so:

  before: [QUARK] net_driver = quark.drivers.nvp_driver.OptimizedNVPDriver

  after: [QUARK] net_driver = quark.drivers.optimized_nvp_driver.OptimizedNVPDriver

  note the new optimized_nvp_driver module instead of nvp_driver

• add swp files to gitignore

[asadoughi]

LGTM. Waiting for travis-ci to merge.

[roaet]

I have concerns that this will dunk stones' PR.

[jmeridth]

This fixes Issue #107

[jmeridth]

roaet: that was a concern, dietz and stones said to go forward.

[roaet]

If they said it was good then LGTM. But uh. what's with travis?

[asadoughi]

Le flake8 fail for travis-ci. @jmeridth, please run tox before creating a pull request to run the unit tests and flake8. pip install tox; tox