optionally sort named extensions

NamedExtensionManager can optionally order loaded extensions to match the
names parameter.
fix type definition of names parameter

Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
Merge pull request #12 from drocco-007/master

NamedExtensionManager can optionally order loaded extensions to match the names parameter.
Correct argument types in name sort tests

The "names" argument is supposed to be a list, not a
single string.

Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
document new name_order param in history

Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>