added "ely_sunset" skybox

I forgot to add to the previous commit.

baseq3r/env/ely_sunset/readme

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+These sky boxes have been downloaded from http://www.3delyvisions.com. They were produced by Colin Lowndes using a properly licensed copy of TerraGen. The author granted permission to distribute these sky boxes under the GNU General Public License version 2. Thanks, Colin!
+
+I (Laszlo Menczel aka Speaker) converted the textures to TGA format and resized the ones not conforming to the power-of-two texture size rule of Quake3. Also renamed the textures to conform to the name conventions of sky boxes in Quake3 (i.e. using the postfixes _bk, _ft, _lf, _rt and _up). The original boxes did not have 'down' textures. I made a 512x512 neutral grey image and added copies of this to each sky box as a fake 'down' texture.

baseq3r/scripts/ely_sunset.shader

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+// Direction & elevation checked and adjusted - Speaker
+
+textures/skies/ely_sunset
+{
+	qer_editorimage env/ely_sunset/sunset_ft.tga
+	surfaceparm noimpact
+	surfaceparm nolightmap
+	q3map_globaltexture
+	q3map_lightsubdivide 256
+	surfaceparm sky
+	q3map_surfacelight 50
+	q3map_sun 1 0.7 0.7 80 350 10
+	skyparms env/ely_sunset/sunset - -
+}