Use server-based default ACL

[b123400]

connect SkygearIO/skygear-server#309

[oursky-travis]

@b123400, thanks for your PR! By analyzing the history of the files in this pull request, we identified @ben181231, @cheungpat and @limouren to be potential reviewers.

[cheungpat]

@b123400 I just want to let you know that the PR needs changes because of lint check errors.

[b123400]

This is interesting, I didn't edit any swift file and swiftlint's failing

[cheungpat]

This is interesting, I didn't edit any swift file and swiftlint's failing

If this happens, this is usually caused by updated swiftlint version which might have additional checks for swift code. To verify that this happened. Trigger a rebuild on the master branch at travis and then make additional pull request to fix the lint errors. Then rebase this pull request.

[cheungpat]

@b123400 Would be great if you could fix the lint on the master branch first.

[b123400]

OK, I guess it will take some time

[cheungpat]

I will merge this pull request after SkygearIO/skygear-server#329 is merged.