Fix readline input history
Fix dispatch of wash builtins, better error reporting

* s/builtinFS/builtinsFS/ to fix export/cd/pwd commands.
* Improve error handling so these kinds of exceptions are reported
  properly rather than silently ignored.
Create web app task for axiom-shell.
Add static http server task to run web_app.

* Due to a Chrome bug (crbug/341909), html imports don't work on page loaded from the local file system, so we have to run the axiom-shell web app form a local server for testing.
Fix polymer loading issue.
Fix typo.

Axiom-shell app is now working end-2-end.
Move polymer components to "lib/polymer"

These components are shared between the Chrome App and the Web App.
Fix issue with hterm.
Convert CRLF to LF.
Minor cleanup.
Create startup code specific to web app.