The addition of assert functions to Userland/js
was done before we had load(..) implemented. Now
that it exists, it seems like the right move the
test helper functions to pure javascript instead
of poluting js with random global functions.
This patch adds support in the parser and interpreter for this:
var a = 1, b = 2, c = a + b;
VariableDeclaration is now a sequence of VariableDeclarators. :^)
