Issue #7: bmwrapper crashes when using fetchmail

Added a CAPA command
Enabled UIDL command
Added LIST x variant
Fixed TOP command
Fixed STAT return message to not add the \r\n

This closes #7
Merge pull request #9 from jimmysong/master

Issue #7: bmwrapper crashes when using fetchmail

Haven't tested on fetchmail so I'll take your word for it.