Merge pull request ampproject#1228 from Automattic/release/0.7.2

Bump 0.7.2 and update changelog

Build 0.7.2

Build 1.0-alpha1

Build 0.7.1

Merge pull request ampproject#1189 from Automattic/update/changelog-1…

….0-alpha

Add PRs and issues from the 1.0 milestone to the changelog

Merge pull request ampproject#1170 from Automattic/update/release-0.7.1

Release 0.7.1

Merge pull request ampproject#1113 from Automattic/update/bump-0.7

Bump 0.7

Merge pull request ampproject#1110 from Automattic/bump/0.7-rc2

Bump 0.7-RC2 and add Piotr Delawski to props

Merge pull request ampproject#1055 from Automattic/update/0.7-changelog

Update changelog for 0.7

Merge pull request ampproject#953 from Automattic/fix/vip-review

VIP Review Changes