Added the gluOrtho2D function.

Signed-off-by: Michael Riss <Michael.Riss@gmx.de>
- remove erroneous, trailing comma at the end of the previously added gluOrtho2D function
- fix my AUTHORS name

Signed-off-by: Michael Riss <Michael.Riss@gmx.de>
Merge pull request #786 from MichaelRiss/master

Added gluOrtho2D