Messages handling improvement

This patch adds "detected SQLi using libinjection with fingerprint" message handling and "Execution Error - PCRE limit exceeded" message handling in controller/index.php.
Added possibility to define explicit rule number for "Execution Error - PCRE limit exceeded" message, so it will be possible to search for this event in database.
Merge pull request #17 from sakalajuraj/0.7.0-devel

Messages handling improvement