Build Infrastructure improvements to apejs

[cscott]

Update the ant build.xml file to match google app engine recommendations; fix some issues with filter() in select.js and generally improve the "out-of-box" experience with the demo code.

[lmatteis]

What do you think of select.js? It should be asynch but it's actually synch. I will merge this once I get a chance of testing it all. Thanks!