Build button

[mischnic]

• [x] Update page state/colors

• [x] update when build is finished

• [x] server-sent events

• [ ] partial rebuild button (latex)

• [ ] abort build

• [x] pending: old log is shown

• [x] keep websockets open while app is open (also update build state in list view)

• [x] Add rebuild button, animate icon,

• [x] check every seconds if finished / or server-sent event

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1. Build page

   • Sorted by date, display date in list, show when build started

2. Build details page

   • Show log, artifact, ...

Design: see https://travis-ci.org/desktop/desktop/builds

[mischnic]

React: 0928cdec906fc4e36f0d370213057c9747c3ce45