Fix VarDecls for tuples. Closes #99. I've implemented it this way since it doesn't require any changes in the frontend. However, I think having TypeTuple expressed as LLVM struct types would make much more sense and open the door to tuple lvalues.

import tango.io.Stdout;

void main()
{
    Stdout("Hello World").newline;
    Stdout.formatln("{} {}", "Hello", "World");
}