Deque impl.

[Robert burner Schadek]

I fixed up a new version http://dpaste.1azy.net/60a714b8

The ranges are now called Deque!(T).Range and Deque!(T).cRange. 
pushFront and pushBack are now insertFront and insertBack to closer 
match SList and DList.
I fixed the docu to match the methods. Next up, making it a struct.

Please comment!
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