[Kde-pim] Write support for Exchange

[Shaheed]

FYI, I'm working on adding support for modifying items to Robert's Exchange 
resource in playground. Please let me know if that overlaps with anything 
anybody else is doing!

This is the initial commit.

http://lists.kde.org/?l=kde-commits&m=132295443031711&w=2

Brad, any thoughts on the OpenChange issue I ran into noted in the commit 
message?
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