mui v3 update

[srghma]

this pr subsumes https://github.com/ThadeuLuz/mui-redux-alerts/pull/4 (just wanted to have the latest changes)

Also it integrates other changes made by @rememberlenny

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For those who can't wait:

add "mui-redux-alerts": "git+https://github.com/srghma/mui-redux-alerts.git#build",

(this branch is made using command git checkout build && git reset --hard master && sed -i 's/^lib$/#\ lib/' .gitignore && npm run build && git add --all && git commit --all -m 'build' && git push --force && git checkout master)