Fixes #107 fetchMessagesByNumberOperationWithFolder documentation
	* Updated sent message to use "numbers" instead of "uids".
	* Passing MCOIndexSet to "numbers".
	* Fixed call to MCORangeMake to pass length as the 2nd parameter.
#170: Fixed message count.
Merge pull request #108 from paulyoung/fetch-messages-by-number-operation-with-folder

Updated fetchMessagesByNumberOperationWithFolder documentation