Changing the check for SERVER_NAME to pass if it is not defined.

On my system $_SERVER["SERVER_NAME"] is not defined when I run php in
a shell, so php gives the error

`Notice: Undefined index: SERVER_NAME`

This small change accounts for that but still exits the program if
SERVER_NAME is not NULL.

Signed-off-by: Eric James Michael Ritz <lobbyjones@gmail.com>
List Glynn Forrest as a contributor in the README
Bump the version number to 1.0.1 for the SERVER_NAME patch
Merge branch 'github/pr/2'

* github/pr/2:
  Bump the version number to 1.0.1 for the SERVER_NAME patch
  List Glynn Forrest as a contributor in the README
  Changing the check for SERVER_NAME to pass if it is not defined.