Update levenshtein method.
Update getting started.md
Update english guide.
Sync migrations.md
Sync engines.md
Update migration guide to latest (fk support).
closes #68.
Sync 4.2 release notes.
closes #64.
Mark command line & 4.2 release notes as translated.
Revert "Add deploy key permission using bcrypt."

This reverts commit cdb68080fc77578e963b1a02c60f9e2638af6c48.

Conflicts:
	Gemfile
	Gemfile.lock
Remove unused stuff.
Update guides version on welcome page.
Update init.md
Update getting_started.md
Generates guide needs nokogiri installed.
Update BASE_PATH.example
Update license.
Update documents zh-TW yaml
Update upgrading md
Sync src: config & testing md
trans say 'hello', rails