Warn user if we change their texture settings.

If the user set a wrapS or wrapT parameter we should warn him if his
texture is not power of two.  We should also warn him if his minFilter
is changing.

src/renderers/WebGLRenderer.js

@@ -5752,10 +5752,17 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 			_gl.texParameteri( textureType, _gl.TEXTURE_WRAP_S, _gl.CLAMP_TO_EDGE );
 			_gl.texParameteri( textureType, _gl.TEXTURE_WRAP_T, _gl.CLAMP_TO_EDGE );
+			
+			if ( texture.wrapS !== THREE.ClampToEdgeWrapping || texture.wrapT !== THREE.ClampToEdgeWrapping) {
+				console.warn('Texture is not power of two. Texture.wrapS and Texture.wrapT is set to THREE.ClampToEdgeWrapping. ('+texture.sourceFile+')');			
+			}
 
 			_gl.texParameteri( textureType, _gl.TEXTURE_MAG_FILTER, filterFallback( texture.magFilter ) );
 			_gl.texParameteri( textureType, _gl.TEXTURE_MIN_FILTER, filterFallback( texture.minFilter ) );
 
+			if ( texture.minFilter !== THREE.NearestFilter && texture.minFilter !== THREE.LinearFilter) {
+				console.warn('Texture is not power of two. Texture.minFilter is set to THREE.LinearFilter or THREE.NearestFilter. ('+texture.sourceFile+')');			
+			}
 		}
 
 		extension = extensions.get( 'EXT_texture_filter_anisotropic' );