Added the resetCache in the toolbox
Symbol.source temporary hack works.

- Symbol.source works for the runtime environement.
   - TODO: fix it once Symbol.pos.source is fixed
- Packaging hierarchy in *-ast.jar fixed
- Update of the demo in consequence.
Merge branch 'master' of https://github.com/aghosn/persistence
Merge pull request #12 from aghosn/master

Symbol.source working with runtime universe