Upgrade jsdoc(api) and fix tests

[zachasme]

Resolves #101.

There was an issue with type applications in Node 12 which was fixed in this commit to jsdoc.

This PR upgrades jsdoc and jsdoc-api. However, this jsdoc upgrade introduces some changes to the output:

• Most of the Closure Compiler tags were added to the list of definitions at some point, but in such a way that the are ignored. I've added a simple plugin which adds @template to the list of tags in jsdoc output. This means users need to use a similar plugin to achieve @template support. There might a better solution.
• Classes and constructors are being merged in strange ways and @class tags without a name results in the class being considered undocumented which in turn means it gets deleted due to data({ undocumented: true }).remove(); in publish.ts. I've added names to fixtures and expected to avoid the problem, but it would be preferable to find a better solution.
• Probably related to the previous point, private constructors meant the class became undocumented, so I've changed the test using @private to @hideconstructor.

Most of these should probably be brought up as issues in jsdoc.

[englercj]

I think the real fix here is to use the new output jsdoc produces for @template rather than hack it back into the "unknown tags" list.

[englercj]

Thanks for this. Let's address removing the plugin in a different PR.