Improve error handling/logging

[gsingh93]

We have some functions that can silently fail, we have other functions that can will show the user a success or failure but not log what the error is, and we have other functions that can throw an exception but never log the error. We should find a proper PHP logger and make our logging story consistent, so errors are easier to debug.

[javuto]

I found a couple of options for logging in PHP that can be installed with composer:

• Klogger (https://github.com/Seldaek/monolog): Last release was one year ago. Seems quite simple to use and powerful.
• Monolog (https://github.com/Seldaek/monolog): Development is active and it is used by a bunch of projects.