Updated regex for Kohana PHP framework

Updated the KEYWORDS_REGEX to include `Debug::`, `Log::DEBUG`.
Removed `die(` from the regex, because every php file in Kohana has `die(` in its first row.
Removed `.phtml` extension from EXTENSIONS_REGEX as it is not relevant for Kohana.
Merge pull request #1 from hkdobrev/kohana

Updated regex for Kohana PHP framework