* Add eslint-plugin-jsx-a11y.

* Fix npm script.

* Adjust npm scripts so test also runs lint.

* Fix existing lint errors.

* Don't break on a11y issues.

* Add role and tabIndex.

* Add vim and Mac files to .gitignore and .dockerignore.

* Handle htmlFor (partially), a that's actually a button.

* Fix missing tabIndex.

* Add cursor:pointer to load-more

* Revert change to load_more.

* Fixes based on review.

* Update yarn.lock.

* Don't try to install fsevents on Linux (hides warning noise).

Fix username styling regression introduced in #1063
Fix report screen background regression introduced in #1415

* Undefined propType in react component `ColumnSettings`.
  Add proper PropTypes definition.

Add a title attribute on mention links for both notifications
and mentions in statuses.

Related to #1350

* Replace column margin with padding

This improves horizontal scrolling behaviour significantly; scrolled flex elements are... a little weird.

* Move clear column button styling to css

eanable focus on ClearColumnButton

Also, since the root component connects to the stream that updates home/notification columns,
there is pretty much no case for refreshing those columns beyond initial load. So, move the
loading of those columns into the root component, to prevent unneccessary reloads when switching tabs
on mobile or resizing desktop window between mobile/desktop layouts

A couple of places were using "reblog" rather than "boost" - this updates them to match the web UI

in the column and what appears as desktop notifications. Settings do not
persist yet