Prevent RAW event change

1. The line causes RAW event malformation. See http://code.google.com/p/waf-fle/issues/detail?id=42
2. We should let RAW event intact.
Bad Host header in the index file handling

This change addresses the issue 43 at http://code.google.com/p/waf-fle/issues/. It reflects problem with parsing of the modsec index file line where is empty or malformed Host header.
Added filter for preserved events
Added filter for preserved events
Added filter for preserved events
Added filter for preserved events
Merge pull request #8 from sakalajuraj/0.7.0-devel

Patches for issues 42 and 43 at http://code.google.com/p/waf-fle/issues/ and added filter for Preserved Events