Merge tag '1.2.1' into develop

1.2.1
Update documentation to note the behaviour of all settings
Remove __init__.py from default skip
Add initial concept of per_file settings starting with __init__.py
Add test to specify specifications
Add support for per-file settings within frosted
Update editorconfig to take advantage of new per-file configuration, cleaning up output of all errors
Merge pull request #31 from timothycrosley/feature/fix-issue-29

Feature/fix issue 29
Add FileSkipped Warning as a message type
Only show file skipped warning if in verbose mode and warning is not skipped
Small improvements to warning handling
Merge pull request #32 from timothycrosley/feature/fix-issue-28

Feature/fix issue 28
Add PythonSyntaxError message class
Write test to match expected behaviour modifications
Add new PythonSyntaxError message type
Update api to use PythonSyntaxError message
Merge pull request #34 from timothycrosley/feature/fix-issue-30

Feature/fix issue 30
Add test for expected __debug__ behaviour
Fix issue #33, adding __debug__ to builtins
Merge pull request #35 from timothycrosley/feature/fix-issue-33

Feature/fix issue 33