Small enhancements

[lenovouser]

• Update dependencies
• Update copyright date

[blakeembrey]

Unfortunately I can't accept these changes. Please do a quick search for existing @types issues and PRs for background info. I'm also not comfortable changing the copyright information - Sebastian hasn't been involved with the project for a long time now.

[lenovouser]

@blakeembrey what do you think about

Copyright (c) 2015 [Sebastian Lenz](http://typedoc.org).<br>
+Copyright (c) 2016-2017 [TypeDoc Contributors](https://github.com/TypeStrong/typedoc/graphs/contributors).<br>

for the copyright date? I can remove it too.

I did some quick research and upgrading handlebars is no problem, only a minor semver change anyways. progress is a major semver change but the API stayed the same (visionmedia/node-progress@d84326e)

@types/fs-extra is the biggest change here, but it actually just aligns the types to the npm version of the actual fs-extra dependency you use in the code.

Both tslint and grunt-tslint should be fine too, I don't see any changes in tslint@5.0.0 that break anything here.

The build, linter and tests all pass or succeed and I tested that it generates documentation correctly and without errors on some of my own projects.

[blakeembrey]

Sure, I'm good with that. I'm always not a lawyer, but looks good regardless 😄

I'm happy with all the dependency updates, just not moving those dependencies into devDependencies or otherwise. If there's an issue with them being in dependencies, we should fix whatever that is directly.

[lenovouser]

Ah, okay. Well. When you install the package globally or in your dependencies all it's dependencies will get installed too (devDependencies not) as far as I know. That's why you usually put these in the devDependencies because they are just needed for development. Or am I missing something?

[blakeembrey]

They are needed for people who use the project programmatically from TypeScript.