remove unused `{{ page.base_url }}` variables, and fix the urls
Change tense to imperative

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Merge pull request #11278 from ZDroid/patch-1

Change tense to imperative
Combine multiple .thumbnail > img styles
Merge pull request #11282 from ZDroid/combination

Combine multiple .thumbnail > img styles
Merge pull request #11274 from wangsai/fix-examples-urls

remove unused `{{ page.base_url }}` variables, and fix the urls
more grunt
3.0.1
Merge branch '3.0.0'

Conflicts:
	dist/css/bootstrap-theme.css
	dist/css/bootstrap-theme.min.css
	dist/css/bootstrap.css
	dist/css/bootstrap.min.css
	scss/_thumbnails.scss