UCDetector warnings: Made things private, deleted unused methods and fields
Changed access to mParts in MimeMultipart so that it can be private too
Added (still rather shallow) missing Javadocs for classes in BinaryAttachmentBody hierarchy
Merge pull request #6 from tobiasbaum/master

More small refactorings
Merge remote-tracking branch 'pgpmime/master' into art/test-roundtrip-mime

Conflicts:
	src/com/fsck/k9/mail/internet/MimeHeader.java