Merge v0.2.0 - features, supports, pagination, other cleanup

This merge fixes several bugs:
* [bug 1063130](https://bugzilla.mozilla.org/show_bug.cgi?id=1063130) - Add features to compat data store
* [bug 1063141](https://bugzilla.mozilla.org/show_bug.cgi?id=1063141) - Add feature support by browser version to compat data store
* [bug 1063567](https://bugzilla.mozilla.org/show_bug.cgi?id=1063567) - Order matters in JSON API representations
* [bug 1063578](https://bugzilla.mozilla.org/show_bug.cgi?id=1063578) - Expand configuration information in browser-version-features
* [bug 1063587](https://bugzilla.mozilla.org/show_bug.cgi?id=1063587) - Resource collections should be paginated
* [bug 1063693](https://bugzilla.mozilla.org/show_bug.cgi?id=1063693) - browser.slug should be write-once
* [bug 1074920](https://bugzilla.mozilla.org/show_bug.cgi?id=1074920) - Restrict coverage to relevant code
* [bug 1074922](https://bugzilla.mozilla.org/show_bug.cgi?id=1074922) - Synchronize contribution instructions with MDN

Some additional work has been deferred:
* [bug 1078682](https://bugzilla.mozilla.org/show_bug.cgi?id=1078682) - Query param include=[relation] includes linked data
* [bug 1078699](https://bugzilla.mozilla.org/show_bug.cgi?id=1078699) - Resources available by slug
* [bug 1082003](https://bugzilla.mozilla.org/show_bug.cgi?id=1082003) - Add API ability to organize features
* [bug 1082006](https://bugzilla.mozilla.org/show_bug.cgi?id=1082006) - Enforce one Support per Feature/Version combo
* [bug 1082016](https://bugzilla.mozilla.org/show_bug.cgi?id=1082016) - Add ability to load multiple instances by IDs

Replaces PRs #2. #3, #4, #5, and #6