- checking Referer of network request to determine
if it is third party request or not
* matching is performed on second-level domains
(there is minor issue with it in Qt < 4.8)
- improved performance with not using regexps when not necessary
- added support for element hiding even with domain restrictions
- almost all types of rules are supported now
* exceptions are only some special cases when rule has
unssuported options (part of rule after $ character)
* those rules are ignored
