Making `pep8` (mostly) happy

Fixing PEP8 code style violations (ignoring line length warnings).
I was running `pep8 --ignore=E501` on all files in the repository and
mostly changed whitespace.

"Special" changes
- In [nvpy/nvpy.py]() I also removed some semicolons
- In [nvpy/simplenote.py]() and [nvpy/view.py]() I replaces all
  "foo.has_key(bar)" instances  with "bar in foo", as suggested by
  `pep8`.

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