[Vimperator] un[let]

[Виктор]

I didn't notice any support for any kind of map leader, so I decided to
try and implement it myself. Since vim uses a variable to declare the
leader, I made this patch, which adds partial support for the let and
unlet commands, as well as a very rudimentary eval function (it's mostly
equivalent to the 6-th level eval function of vim), and a function to
return a reference a variable, as well as it's type. 
-- 
Виктор Кожухаров /Viktor Kojouharov/
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