[docs] Use material-ui-icons package

[mbrookes]

• PR has tests / docs demo, and is linted.

• Commit and PR titles begin with [ComponentName], and are in imperative form: "[Component] Fix leaky abstraction".

• Description explains the issue / use-case resolved, and auto-closes the related issue(s) (http://tr.im/vFqem).

• Replace local icons with packaged icons

• Remove unneeded icons from src/svg-icons

• Replace font-icon with SvgIcons in IconButtons

• Replace uses of Icon with material-ui-icons (except Icon docs examples)

• Update & expand Style > Icons doc page

[oliviertassinari]

Why not changing the webpack conf to use the icons on the repository?

[oliviertassinari]

I fear the maintenance cost of keeping up to date.

[mbrookes]

@oliviertassinari - the icons aren't in the repository. I guess we could add them, but unless there's major change, there is no maintenance cost.

[oliviertassinari]

@mbrookes Alright, choose what you think is best 👍 .

[mbrookes]

This is simplest for now. We can always revisit it if it causes an unforseen problem.

[mbrookes]

Any idea what's causing CircleCi to fail? Tests are passing locally (those that I can run at least). Unfortunately CircleCI just gives a busy spinner when I try to see what the problem is:

Much preferred Travis! 😄

[oliviertassinari]

✖ EnhancedTable

A visual regression test fails

[mbrookes]

@oliviertassinari I might need your help to get the visual regression tests working again on my machine. In the meantime, would you mind fixing whatever i broke for this PR? 😊

If you wanted to add the es6 icons to the repo at the same time, I'm fine with that on reflection, as it would mean we don't need to keep a separate copy of the icons used in components in src/svg-icons.

[oliviertassinari]

@mbrookes I'm updating the baseline. The sooner argos-ci will be on, the better. We will simply be able to accept the changes.

[mbrookes]

We will simply be able to accept the changes.

That sounds ideal! 👍