Basic logging of issues in certificates.

Added reporting some of issues with certificates (around line 451 in monitor.py is readable list of everything I'm looking for). Currently it only prints out list of problems in each certificate and then stats (how many certificates have given error).
I'll add some tests soon, I just want to make sure that code looks reasonable before I write them.
It's just that current stats printout shouldn't be grouped by everything that is in Highlight (if we use default ones, then with current stats code fact that there is illegal character at some position will be different from the same illegal character in different one etc.). But I guess I should simply change stats calculating code to something smarter :)