Fix for 'import-order' setting

Fix for 'import-order' setting:

• disable by default
• fix for turn it on or off

New linting tools

• Add 'disable current file linting' feature
• Add new linting tool: flake8-debugger
• Add new linting tool: flake8-import-order (disabled by default)

Update lint tools versions

• pep8: 1.7.0
• flake8: 2.5.2
• pyflakes: 1.0.0
• mccabe: 0.4.0
• pep257->pydocstyle: 1.0.0
• pep8-naming: 0.3.3

IMPORTANT: Turn 'pydocstyle' linter on by default