[mms] Add Horde_Mail_Mbox_Parse.
mailbox parsing moved to Horde_Mail
[mms] Fix another issue with older versions of PHP in Horde_String_Transliterate.
Fix line endings
Fix parsing eml files that contain an unpadded From at beginning of the line.
Use same data structure to store MBOX and EML data

Fixes count() return for single message parsing
Add test case for unpadded From parsing
Released Horde_Util-2.5.1
Development mode for Horde_Util-2.5.2