Fixes #457 and #461
Fix FOUC-related repositioning of logo, 1st fold when
upgrading on landing page.
Remove tutorial iframe on homepage.
- saves network requests
- also inline vulcanize with --inline
use controls=2 for perf
Fix Python SimpleHTTPServer module name
Fix repeated typo from “x is y” to “x in y”, fixed use of non-possessive “it's”.
Merge pull request #496 from BrianGeppert/master

Fix repeated typo from “x is y” to “x in y”, fixed use of non-possessive...
Merge pull request #494 from Electron-libre/patch-1

Fix Python SimpleHTTPServer module name
Merge branch 'master' of https://github.com/Polymer/docs into tutorial-updates

Conflicts:
	docs/start/tutorial/intro.md