* new example: image-reference-collector (indexedDB file storage demo)
* fix: added missing deps, updated all npm dependencies and webpack config to v.2
* chore: Renamed the example to store-collected-images
* chore: Removed from utils/image-store any direct call to the UI code
* move example built using webpack into its own subdir
* tweak browser action title
* added plain webextension example (without webpack build step)
* added README.md file to plain webextension example
* small changed based on the review comments
* fixed typo in store-collected-images example (webpack-based version)
* Remove React from the store-collected-images (plain webextension version)
* Fix eslint errors on store-collected-images example (both versions)
* Fix some typos in the README files
