Buildprocess: use module "load-grunt-tasks" to load grunt tasks directly from the package.json
correct indentation
Update less.js to v1.5.1.

This fixes an error with `&:extend(.clearfix all)` when using the customizer.
Merge pull request #11812 from tlindig/load_grunt_tasks

Build process: use module "load-grunt-tasks" to load grunt tasks
Merge pull request #11818 from XhmikosR/less.js

Update less.js to v1.5.1.
Update README.md.

Mention that Python needs to be in PATH for Pygments to work and thus jekyll not fail.
README.md: mention an alternative workaround for the jekyll issue on Windows.
Help Windows users install Jekyll
Merge pull request #11832 from twbs/run_jekyll_on_windows

Help Windows users install Jekyll
Merge pull request #11830 from XhmikosR/jekyll-windows

Update Jekyll on Windows info
Combine updates to Windows Jekyll stuff
Add docs-assets/css/docs.css to csslint too.
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