Depends on https://code.launchpad.net/~andyrock/nux/focus-on-enter
Implements dash key navigation.
known issues:
- shift + tab doesn't work well because of this: bug 931393. Fixes: https://bugs.launchpad.net/bugs/817436, https://bugs.launchpad.net/bugs/844033, https://bugs.launchpad.net/bugs/891648. Approved by John Lea, Tim Penhey.