TRANSPARENT parameter case sensitivity

TRANSPARENT case patch

Example configurations:

This configuration will result in a request url being constructed by OpenLayers that includes the TRANSPARENT parameter. However, the case of the value "true" is incorrect.

var sst = new OpenLayers.Layer.WMS( "AMSRE SST",

"http://localhost:8080/wms/wms",

{layers: "AMSRE_SST_M", transparent: "true", format:'image/png'} );

---

This configuration uses the correct case. However, the url constructed by OpenLayers does not include the TRANSPARENT parameter.

var sst = new OpenLayers.Layer.WMS( "AMSRE SST",

"http://localhost:8080/wms/wms",

{layers: "AMSRE_SST_M", transparent: "TRUE", format:'image/png'} );

I think it should be better to use the toLowerCase function.

compromise... can't use toLowerCase easily because the value might be boolean, not string

taking sde's patch and applying the same logic to WMS/Untiled. Goodness knows that it is embarrassing and wrong the way those two classes are the same and yet different. but those are the breaks right now. anyways. i've also augmented the wms layer's tests (not those of untiled because there *are* no those of untiled). alas alas. sigh

TESTS?! what what?! go ahead and commit

fixed with r3290 -- thanks to kablukiw for finding/reporting this, sde for making the patch and reviewing my updated one :-)