FLUID-5217: Directory restructuring

Reorganized the demos based on comments from the jira and on list.

http://fluid.2324889.n4.nabble.com/Documentation-decisions-td9105.html
http://issues.fluidproject.org/browse/FLUID-5217

There are quite a few changes, including the following:

* path changes
* removed old demos and tests
* added new examples
* promoted ToC manual tests to the demos
* modified the build scripts (src directory is now part of the generated builds).
Doe "build/" directory need to be ignored since it's an interim directory created by the build script and will be cleaned up right away at the end of the build process? Do I missed anything for the existence of this directory?

Same question for "build/" in .gitignore