Added OG meta tags for title, type, url and image

Step 1 towards making share previews prettier.
Changes deprecated link to grunt-saucelabs-qunit to grunt-saucelabs

Fixes 552
Fixes consistent misspelling of 'substitute'.
Replaces typo 'pased' with 'passed'.
Replaces typo 'Takaway' with 'Takeaway'.
Fixes consistent misspelling of 'optimized'.

Closes #555
Adds closing backtick to README command.
Added lono.png to /imgs
Merge pull request #568 from jbnicolai/fix/missing-closing-backtick

Adds closing backtick to README command.
Merge pull request #567 from jbnicolai/fix/555

Fix/555
Merge pull request #566 from jbnicolai/fix/552

Changes deprecated link to grunt-saucelabs-qunit to grunt-saucelabs
Merge pull request #558 from achalv/master

Fix for #546 - Open Graph tags for title, type, url and image
Merges src/README.md into README.md.
Moves src/* to the project root.
Updates path to Makefile.

Closes #564