Add := digraph to D

[ixid]

It is a terse way of assigning and initializing an automatically 
typed variable, helping meld what I understand one of D's aims to 
be that of the power of a C/C++ language with some of the 
syntactic elegance of languages like Python. In broad terms D and 
Go would seem to outline the general direction of C/C++ ideas, it 
would seem like a good idea to use the good ideas of each to move 
toward the optimum language.