Improve command constructor test

Check for the number of failed attempts instead of the content of the exception message, as the message can be quite different between PHP versions and HHVM.

Improve inline keyboard button

Fix return value for handle() method.

Add issue and pull request templates.

[skip ci]

Correct DocBlock comments.

Update inline comments for hook.php and getUpdatesCLI.php

Make sure that logging is set directly after Telegram object initialisation. (thanks @jacklul for pointing this out)
Proofread and update utils.md file.

Update readme and examples for enableAdmin(s)

Improve test code

Return an empty response when an empty inline query is passed.

fix user empty name

See discussion here: #250 

Fixes issue with file uploading

allow value 0 for duration

Add some helper variables to tests, to cut down the amount of code a bit and make it more readable.

Make fake entity ids random and set current date/time.

Add flexible methods

Improve travis config

Correct the getText() method of the Message entity

- Include PHP nightly build
- Keep composer packages cached for faster testing
- Uniform indentation (2 spaces)
- Let travis manage composer updates (don't self-update)

Correct the getText() method of the Message entity to correctly return the text, with and without the command.