Enable fixed pep8 rules (in master branch)

Here is pep8.py statistics of left issues (first number in row --- number of occurrences):

```
11      E122 continuation line missing indentation or outdented
1       E126 continuation line over-indented for hanging indent
58      E128 continuation line under-indented for visual indent
6       E211 whitespace before '('
485     E501 line too long (102 > 100 characters)
7       E711 comparison to None should be 'if cond is None:'
8       E712 comparison to False should be 'if cond is False:' or 'if not cond:'
2       E721 do not compare types, use 'isinstance()'
```

Complete `make pep8` log with all enabled issues: https://gist.github.com/vrutsky/7344189