Fix typos in comments

Closes #1950
Implement `singleGroups` option
fixup! Correct typo
fixup! Correct typo in unit tests
Updates to yield delegation linting. Fixes gh-1544
Fix insane indents.
Restore fixture
Use state.tokens.next.value
Remove redundant esnext flag check
Merge pull request #1948 from rwaldron/1544

Updates to yield delegation linting. Fixes gh-1544
Parse/lint NameSpaceImport module declaration.

Closes gh-1936
Merge pull request #1945 from caitp/issue-1936

Parse/lint NameSpaceImport module declaration.