invalid ui-icon PNGs in download builds

[Antti Kaihola]

As of 1.8rc3, the ​http://jqueryui.com/download page creates builds with invalid PNG images.

If I select the Humanity theme and select the following Components:

• Core
• Widget
• Mouse
• Position
• Draggable
• Resizable
• Dialog
• Tabs

the following files are invalid in the /css/humanity/images/ directory of the resulting jquery-ui-1.8rc3.custom.zip file:

$ cat ui-icons_f08000_256x240.png
<br />
<b>Fatal error</b>:  Call to undefined function ImageColorMatch() in
<b>/srv/jqueryui.com/htdocs/themeroller/images/phpthumb.filters.php</b>
on line <b>1040</b><br />

$ cat ui-icons_f35f07_256x240.png
<br />
<b>Fatal error</b>:  Call to undefined function ImageColorMatch() in
<b>/srv/jqueryui.com/htdocs/themeroller/images/phpthumb.filters.php</b>
on line <b>1040</b><br />

$ cat ui-icons_ff7519_256x240.png
<br />
<b>Fatal error</b>:  Call to undefined function ImageColorMatch() in
<b>/srv/jqueryui.com/htdocs/themeroller/images/phpthumb.filters.php</b>
on line <b>1040</b><br />

$ cat ui-icons_ffffff_256x240.png
<br />
<b>Fatal error</b>:  Call to undefined function ImageColorMatch() in
<b>/srv/jqueryui.com/htdocs/themeroller/images/phpthumb.filters.php</b>
on line <b>1040</b><br />

[bornemix]

Note: This function is only available if PHP is compiled with the bundled version of the GD library.

Note: This function requires GD 2.0.1 or later (2.0.28 or later is recommended).

[mikehostetler]

Fixed and pushed into production.