Sync changes from upstream repository
Merge pull request #648 from github/update-1417426904
Sync changes from upstream repository
Merge pull request #649 from github/update-1417427139
Sync changes from upstream repository
Merge pull request #650 from github/update-1417434711
Sync changes from upstream repository
Merge pull request #651 from github/update-1417443248
Fix punctuation
Clarify timeline
Sync changes from upstream repository
Merge pull request #652 from github/update-1417482739
Sync changes from upstream repository
Merge pull request #653 from github/update-1417558358
Use sentence case for section headings
Sync changes from upstream repository
Merge pull request #654 from github/update-1417606170
Sync changes from upstream repository
Merge pull request #655 from github/update-1417626311
Sync changes from upstream repository