Fab-polish

Since new major version of fabric library was released and broke backward compatibility, restricting to earlier major version as a hotfix.

New sniffs
- `python_code_analyzer`
- `fix_file_permission`
- `fix_script_permission`
- `fix_white_space`
- `convert_tab_spaces`
- `check_migration_branch`
- `check_python_debug_info`
- `check_php_debug_info`
- `check_image_edited`
- `composer validate`
- `run_eslint`
- `check_preg_replace`

- Fixes running all sniffs in contrib when atleast one is imported

Polish git versioned source code using Fabric

Package available in PyPI: https://pypi.python.org/pypi/fab-polish