Add specifications

Builds on PR #8.

Fixes bugs:
* [bug 1063150](https://bugzilla.mozilla.org/show_bug.cgi?id=1063150) - Add specification statuses to compat data store (renamed to Maturities)
* [bug 1063148](https://bugzilla.mozilla.org/show_bug.cgi?id=1063148) - Add specification sections to compat data store (renamed to Sections)
* [bug 1063144](https://bugzilla.mozilla.org/show_bug.cgi?id=1063148) - Add specifications to compat data store