BHV-2574: Fixes to allow sampler to build as webOS app:

- Remove experimental "Switch to Nightly" feature from app, so we don't need redirection of samples source
- Remove $enyo/$lib macros from samples manifest, per above
- When deleting an addSamples, use removeItem rather than setItem
- Add guards against badly formatted "addSamples" stored in localStorage
- Add deploy.json that copies lib samples
- Add webOS appinfo.json