Add Logging

[danyspin97]

Add logging to php errors and Bot API erros.

[ghost]

I'm working on this issue but I haven't enough time to do all by myself so feel free to contribute, here's a list of progress:

• [x] Add Monolog as logging library
• [x] Add logging for execRequest (which's the core of HTTP requests in PhpBotFramework)
• [x] Add logging for setPayment
• [ ] Add logging for inline queries
• [ ] Add logging for commands (command unavailable, users who try to run admin commands, etc..)