Added some better wording and callouts.
Omit needless meta and fix HTML5Rocks image
optimized image size
Add author image instead of HTML5Rocks logo as share image
few changes to talking head content, and added addyosmani
updating a few items wrt image tooling.
Missing "="
Add link[rel=author]
www.google.com/profiles instead of plus.google.com
Merge pull request #597 from agektmr/optimize_images

optimized image size
Merge pull request #596 from agektmr/semantics

Omit needless meta and fix HTML5Rocks image
Fixes #606 - adding link to insights checker
Merge pull request #607 from PaulKinlan/pagespeedinsightslink

Fixes #606 - adding link to insights checker
Merge pull request #601 from mainroach/master

Updated "Image compression for web developers" tutorial
custom element lifecycle callbacks. Fixes #609
Merge branch 'master' of https://github.com/html5rocks/www.html5rocks.com
Fixed two broken links in image compression article.
Changed publication date for image compression article to reflect reality.
Fixing broken anchor in article
Merge branch 'master' of https://github.com/html5rocks/www.html5rocks.com