Create an automatically numbered list

Is there a way to create an automatically numbered list in Markdown format? Currently, I have to manually enter in what number I want to appear, but if I insert items in the list, it is cumbersome to have to re-number all the following items.

That should happen automatically (at least in SO flavored MD):

1. test 1
2. test 2

The code I used it:

1. test 1
1. test 2

The same works for GitHub flavored MD: https://gist.github.com/3489721

You can test it here: https://meta.stackexchange.com/questions/3122/formatting-sandbox

if you type the first one with a one like this 1. lorem then as long as the rest have a space after the dot then it should work

1. lorem
4. hello
3. blah blah blah

you should get this:

1. lorem
2. hello
3. blah blah blah