Blue - v0.0.17

Add RouteWrapper HOC

In beacon embed, we had a problem where we wanted to fetch some data from the server before navigating to a new . To make this easier, this Pull Request creates a Higher Order Component, RouteWrapper, which wraps around components and adds fetch and to properties. The to property works like the to on a React Router <Link>, but the fetch property lets you specify a thunk-returning function to fetch data before triggering the route specified in to.

The <Link> and <Button> components have been wrapped with RouteWrapper, which means we can now do things like:

<Link fetch="fetchArticle" to={`docs/articles/${id}`}>
<Button fetch="fetchArticles" to="docs/articles">
<Button to="synchronous/route/path">

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Implement specified enum propTypes

This update provides most components with a specific range of acceptable values.

For example, the states (string) that we use in Blue are error, success, warning. Components with a state prop should only accept these values, as other values will fall to render the correct styling.

To be things easier (and more consistent), I've added constants/propTypes.js that contain an export of common propTypes, such as state or size.