Patch for pyjon to support Underscore.js

patch.diff

diff --git a/pyjon/interpr.py b/pyjon/interpr.py
index 5520d95..4c639b4 100644
--- a/pyjon/interpr.py
+++ b/pyjon/interpr.py
@@ -1467,6 +1467,11 @@ class array_proto(list, Prototype):
     def pop(self): return list.pop(self)
 
     @publicmethod
+    def sort(self, sortfn=None):
+        list.sort(self, sortfn)
+        return self
+
+    @publicmethod
     def slice(this, s=0, i=None): 
         if i == None: i = len(this)
         return array_proto(*this[s:i])
@@ -1518,6 +1523,7 @@ class Array(JS_Function):
     def __getattr__(self, k):
         if k == 'constructor': return array
         elif k == '__proto__': return array_prototype
+        elif k == 'isArray': return isArray
         else: Prototype.__getattr__(self, k)
 
     def __newInstance__(self, *args):