import SCSS tools

[nlhkabu]

There are a number of SCSS libraries that could be included dynamically. Currently we have a copy of each in the codebase.

• warehouse/static/sass/resets/_boxsizing.scss
• warehouse/static/sass/resets/_normalize.scss
• warehouse/static/sass/resets/_reset.scss
• warehouse/static/sass/tools/bourbon
• warehouse/static/sass/tools/neat

[brainwane]

In our meeting today Nicole said this refactor is low-priority and doesn't belong to any particular milestone. Just noting that here.

[miketheman]

Note: Neat is no longer maintained as of October 2019: thoughtbot/neat@6c76100