Adding JSDocs checks

[gauntface]

This will fail the test until #1080 is merged, then we can re-run and check the tests pass.

Checks for:

• No globals
• No module.exports (Something that is showing up in the WebFundamentals build for v3.0.0-alpha.1) at the moment.

[addyosmani]

LGTM.

[coveralls]

Changes Unknown when pulling cb90475 on jsdocs-checks into ** on v3**.

[coveralls]

Changes Unknown when pulling d55f188 on jsdocs-checks into ** on v3**.

[coveralls]

Changes Unknown when pulling 1e4b46c on jsdocs-checks into ** on v3**.

[coveralls]

Changes Unknown when pulling 11cb2e3 on jsdocs-checks into ** on v3**.

[workbox-pr-bot]

PR-Bot Size Plugin

Changed File Sizes

No file sizes have changed.

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All File Sizes

View Table

File	Before	After	Change	GZipped
packages/workbox-background-sync/build/workbox-background-sync.prod.js	3.17 KB	3.17 KB	0%	1.34 KB
packages/workbox-broadcast-cache-update/build/workbox-broadcast-cache-update.prod.js	1.07 KB	1.07 KB	0%	567 B
packages/workbox-build/build/index.js	16.62 KB	16.62 KB	0%	5.07 KB
packages/workbox-cache-expiration/build/workbox-cache-expiration.prod.js	3.15 KB	3.15 KB	0%	1.16 KB
packages/workbox-cacheable-response/build/workbox-cacheable-response.prod.js	610 B	610 B	0%	344 B
packages/workbox-cli/build/app.js	4.49 KB	4.49 KB	0%	1.61 KB
packages/workbox-cli/build/bin.js	2.53 KB	2.53 KB	0%	1.07 KB
packages/workbox-core/build/workbox-core.prod.js	6.67 KB	6.67 KB	0%	2.61 KB
packages/workbox-google-analytics/build/workbox-google-analytics.prod.js	1.93 KB	1.93 KB	0%	961 B
packages/workbox-precaching/build/workbox-precaching.prod.js	4.75 KB	4.75 KB	0%	1.84 KB
packages/workbox-routing/build/workbox-routing.prod.js	2.74 KB	2.74 KB	0%	1.23 KB
packages/workbox-strategies/build/workbox-strategies.prod.js	3.54 KB	3.54 KB	0%	1.13 KB
packages/workbox-sw/build/workbox-sw.js	1.35 KB	1.35 KB	0%	737 B
packages/workbox-webpack-plugin/build/index.js	7.46 KB	7.46 KB	0%	2.49 KB

Workbox Aggregate Size Plugin

☠️ WARNING ☠️

We are using 152% of our max size budget.

Total Size: 22.26KB
Percentage of Size Used: 152%

Gzipped: 8.84KB

[coveralls]

Changes Unknown when pulling 78a7f0c on jsdocs-checks into ** on v3**.