Feature/smartinterface

Add conversation tests and a few matching helpers.

Small cleanup fixes

Merge branch 'feature/smartinterface' of https://github.com/MBoretto/php-telegram-bot into feature/smartinterface

When the command ends, the last step should be to actually "stop" it, not before, as some data already goes lost when stopping the conversation.

reintroduced update()

Some typo corrections.

Since PHP 7 is officially out, make travis test it properly.

Conversations code review

Create MySQL database with correct table structure.

* mboretto/feature/smartinterface:
  conversation as internal member

Conflicts:
	src/Commands/AdminCommands/SendtochannelCommand.php

Refactor a bit to facilitate testing.
Add missing documentation.