add filtering field "from"
FIX crashes when emp not initialized
foramt & remove unused code
add buffered write in mail extractor
add filtering field subject
remove fields FILE_NAME & MESSAGE_ID from XML structure
add checking if *.pdf file is empty
add zfork
add ifdef __native_client__ for compile for host
remove blank lines
Merge pull request #19 from VarchukVladimir/v1

Fix some bugs, format code, mail extractor optimization