Changing class names alert, glass, message, spinner to be prefixed by le...

I was having issues with the CSS classes and some of the Bootstrap namespacing.  This fixed it.
![screenshot from 2013-09-20 12 38 06](https://f.cloud.github.com/assets/550909/1183295/ffe158c4-222c-11e3-908d-a17105929334.png)
...aflet-geosearch- to avoid namespace issues (with Bootstrap)