Bug when Multipart/Alternative is not lowercase.

[RenierZA]

I came across a message (X-Mailer: IncrediMail) where content types were not in lowercase. This still works for most parts, but Multipart/Alternative causes getTextContent() to fail.

I'm unable to do a pull request currently, but it can be fixed by adding strtolower() in line 121 of Message.php:

private function addToAlternativeContentPartFromParsed(MimePart $part)
{
    $partType = strtolower($this->contentPart->getHeaderValue('Content-Type'));

[zbateson]

Excellent, thanks @RenierZA

Fixed in master and will be released in 0.3.2 early December.