Fix typo in Sass variable arguments documentation.
Added gem version badge to README
Mark exec_test as executable.
Merge pull request #866 from malept/docs-typo

Fix typo in Sass variable arguments documentation.
Merge pull request #867 from kethomassen/patch-1

Added gem version badge to README
Teach @extend that pseudo-elements don't work like pseudo-classes.

Closes #878
Merge branch 'stable' of github.com:nex3/sass into stable
Merge branch 'stable'

Conflicts:
	doc-src/SASS_CHANGELOG.md
Merge remote-tracking branch 'origin/master'