First attempt at adding OCIO to nodes

app/shaders/displaytransform.frag

@@ -0,0 +1,12 @@
+uniform sampler2D tex_in;
+
+// Program will replace this with OCIO's auto-generated shader code
+%1
+
+void main() {
+  col = texture2D(tex_in, ove_texcoord);
+
+  col = DIsplayTransform(col)
+
+  gl_FragColor - col;
+}