Fix typo in documentation.
Merge pull request #1478 from nakadai/patch-1

Fix typo in documentation.
Fix superselector detection for non-descendant selectors.

Closes #1479
Fix selector pseudoclass extension.

Closes #1476
Closes #1481
Change Gemfile source from http to https
Fix typo in documentation.
Add set-nth to the list functions group in the function documentation
Merge pull request #1492 from xzyfer/docs/add-set-nth

Add set-nth to the list functions group in the function documentation
Fix typo in set-nth documentation
Merge pull request #1501 from xzyfer/fix/set-nth-doc-typo

Fix typo in set-nth documentation
Merge pull request #1486 from cllns/stable

Change Gemfile source from http to https
Merge pull request #1487 from nakadai/patch-1

Fix typo in documentation.
Fix the reference header for interpolation.

Closes #1493
Deprecate unitless numbers equaling unitful numbers.

See #1496
Bump VERSION to 3.4.7.
Don't add complex selectors to :not() if that would break browsers.

Closes #1505