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.

various

inline query command fixed

Small optimization

Fix cancel command if no database is connected.

Using getUpdates needs a valid database connection.

Add inline line breaks in logs.