Release 0.7.0 - Githubissues

[x] Add contributor props.
[x] Bump version numbers. ack -Q 0.6.2 $(git ls-files) and replace with 0.7.0 where appropriate
[x] Make sure all unmilestoned PRs and issues are milestoned if fixed in release.
[x] Add changelog to readme.
[x] Draft new GitHub release tag 0.7.0 on master, with ZIP build via grunt build; cd build; zip -r ../customize-snapshots-0.7.0.zip *; cd -; cp customize-snapshots-0.7.0.zip ~/Downloads/customize-snapshots.zip, and with link to readme on tag tree: https://github.com/xwp/wp-customize-snapshots/blob/0.7.0/readme.md#changelog
[x] Test build by installing plugin build ZIP.
[x] Merge release PR.
[x] Wait for Travis build for master branch to go ✅ .
[x] Deploy to WordPress.org via grunt deploy. Remember to look at SVN diff.
[x] Publish GitHub release.
[x] Close GitHub milestone.

pbpaste | sed "s/$PREV_NEW/$NEXT_NEW/g" | sed "s/$PREV_OLD/$PREV_NEW/g" | sed 's:\[x:\[ :' | pbcopy

xwp / wp-customize-snapshots