Fix for #497

One would expect the form:

    > (defmacro a (&rest b) b)
    > (a 1 2)

To return a tuple object but we have no Hy model so it returns a HyList.
Not sure if this is the right thing to do.

hy/macros.py

@@ -115,6 +115,7 @@ _wrappers = {
     str_type: HyString,
     dict: lambda d: HyDict(_wrap_value(x) for x in sum(d.items(), ())),
     list: lambda l: HyList(_wrap_value(x) for x in l),
+    tuple: lambda t: HyList(_wrap_value(x) for x in t),
     type(None): lambda foo: HySymbol("None"),
 }
 

tests/native_tests/native_macros.hy

@@ -31,6 +31,9 @@
 (defmacro a-list [] [1 2])
 (assert (= (a-list) [1 2]))
 
+(defmacro a-tuple [&rest b] b)
+(assert (= (a-tuple 1 2) [1 2]))
+
 (defmacro a-dict [] {1 2})
 (assert (= (a-dict) {1 2}))