Run away from private repos

• Publish docker images to Docker public repository
• Update composer.lock for newer versions of dependencies

Huge inside but nothing really changes outside.

• New checks: seeCcInLastEmail and seeCcInLastEmailTo
• Imap Provider included
• Dockerfiles for Providers for testing purposes and fun
• Now code are sniffed

Fix some requrements

1.2.1

Move testkit to dev requirement

1.2

Main changes:

Added ImapMail provider that lives in separate repo.
Added support for MailHog.
Added support for email's attachment checking.
Added support for email's CC checking.

New Mail Providers

New providers:

• MailTrap Provider
• LatherMail provider

Fix Travis build config

Initial release

1.0

Move Provider's based class to separate directory