chore(grunt): remove unnecessary white spaces
docs(tutorial/index): improve accessibility

- Adds accessibility attributes to links and images.
- Adds a note on using NVM for node.
docs(tutorial): update step_08.ngdoc

Closes #6537
docs(guide/forms): fix a typo

Closes #6556
docs(guide/services): clean up typos
docs(tutorial): update step_09.ngdoc

Closes #5991
docs(directive.ngdoc): typo fix
style: enable jscs requireLeftStickedOperators rule

Closed #6544.
chore(publish.sh): publish to all serving backends