add loading spinner as extension

[sheppard]

Replicate the functionality of the old OpenLayers LoadingPanel as a GeoMOOSE extension.

See:
http://www.geomoose.org/wiki/index.php/Oregon_County_Spring_2012_Project_Phase_1

http://www.geomoose.org/wiki/index.php/Add_Loading_Symbol_to_Map

[sheppard]

I (re-)implemented this by utilizing the dojox Standby widget.

The changes I made to trunk were as follows:

1. Add dojox.widget.Standby to dojo build (see attached patch)

2. Copy libs/dojo-1.6.1/dojox/widget/Standby/images/loading.gif to build/dojox/widget/Standby/images/loading.gif (adding directories as needed). This assumes an updated build directory structure, see #121.

3. Create/update the LoadingSpinner extension (attached).

If it is undesirable to add dojox.widget.Standby to the build I can come up with a different process. The advantage of this approach is that anyone can use the extension just by adding the <script> without any additional configuration.

[sheppard]

Add dojox.widget.Standby to build

[sheppard]

Loading spinner widget

[sheppard]

Like #124, this extension won't work in IE unless standards mode is enabled (see #125).

[theduckylittle]

r873

[sheppard]

Looks like the code is working, but still needs build/dojox/widget/Standby/images/loading.gif to be checked in.

(Wondering if #128 might provide a better long-term solution).

[theduckylittle]

#128 is the right answer, I'm going to work on *an* answer for a minute here...

[theduckylittle]

r892

Localized the loading image. I think that is a better demonstration for those looking to customize anyway.