Flightjs updates

Fix demo application link and twitter handle (README included). Add articles, guides, videos and community links. Add debug mode. Upgrade depot, flight, jQuery, requirejs and dev deps. Sync bower since some deps are aready upgraded but not depicted to bower.json. Adjust flight attributes to new api. Enabled debug mode for event 'visualisation' and ensuring only serialisable data are passed to components. Moved app to page folder. Introduced new paths for cleaner deps. Upgrade karma and deps. Update karma conf according to new dependencies. Replay paths to test-main and spec-dep paths. Update specs to new jasmine-flight api. Upgrade bower components.

Update to Polymer.latest

(contributing.md) grammatical changes for clarity

Changed some wording for better grammatical structure.

BEFORE: "This is why we can't accept all submissions."
AFTER: "This is why we can't accept every submission."

BEFORE: "However, we're always open to look at novel ways to solve existing problems."
AFTER: "However, we're always open to looking at novel ways to solve existing problems."

Remove deprecated JSHint options

Also updates code style for the affected file only.

Fixes #1086
Closes #1087

Ampersand.js - extract methods to collection

Browser tests: Flatten loop

Update Vue.js implementation to use latest version & move from labs to first tab

Fixed JSHint error 'Strings must use singlequote'

fix #1071: Olives: Update Olives and Emily to latest 1.x versions

fix #1073 (ampersand demo 404)