Error duplication for non generic exceptions

[ftrrtf]

@ArturMoczulski hi, I guess condition (from MR #240)
strpos($last_error['message'], 'Uncaught exception') === 0 should be replaced by strpos($last_error['message'], 'Uncaught') === 0 (allowed types of exception is checked on the line above).

Because for now only generic exceptions will be skipped by the condition on fatal handler, and MyException will be logged one more time.

We are experiencing such issue with each symfony/php7 app (have not tested with other environments), when even fatals are exceptions, plus wrapped by symfony stuff, like:
Uncaught Symfony\\Component\\Debug\\Exception\\FatalThrowableError: Call to a member function getId() on null in /var/www/...

[ArturMoczulski]

This is resolved in PR #295