Add latest version of Python 2 (#2668)

var/spack/repos/builtin/packages/python/package.py

@@ -41,6 +41,8 @@ class Python(Package):
 
     homepage = "http://www.python.org"
     url = "http://www.python.org/ftp/python/2.7.8/Python-2.7.8.tgz"
+    list_url = "https://www.python.org/downloads/"
+    list_depth = 2
 
     version('3.5.2', '3fe8434643a78630c61c6464fe2e7e72')
     version('3.5.1', 'be78e48cdfc1a7ad90efff146dce6cfe')
@@ -49,7 +51,8 @@ class Python(Package):
     version('3.3.6', 'cdb3cd08f96f074b3f3994ccb51063e9')
     version('3.2.6', '23815d82ae706e9b781ca65865353d39')
     version('3.1.5', '02196d3fc7bc76bdda68aa36b0dd16ab')
-    version('2.7.12', '88d61f82e3616a4be952828b3694109d', preferred=True)
+    version('2.7.13', '17add4bf0ad0ec2f08e0cae6d205c700', preferred=True)
+    version('2.7.12', '88d61f82e3616a4be952828b3694109d')
     version('2.7.11', '6b6076ec9e93f05dd63e47eb9c15728b')
     version('2.7.10', 'd7547558fd673bd9d38e2108c6b42521')
     version('2.7.9', '5eebcaa0030dc4061156d3429657fb83')