Getting things for developers _of Amber_ out of root.

Into one place: `internals` directory.
To develop, one must start `http://localhost:4000/internal/`.
amberc, release.sh, setversion.sh are executable
Fix jshint:grunt to new location of grunt tasks.
Deprecate amber_css, {css.images} -> support/resources
Merge pull request #1001 from herby/compacting

Compacting directory structure