Allow custom quote regex and specify content encding

Need the ability to specify custom regex for different qouting header in e-mail messages. Every county has it's own "standards" for that and english based regexp not enough for that.
So the tests expanded with a hungarian quoute header check too.

Another modification is for retrieving content when we know the encoding type then convert it to default UTF-8 character set, tests again expanded with ISO-8859-2 encoding.

PS.: by default phpunit can't run from commandline need to fix test/bootsrap.php