Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Added edit button on page show view
  Added pre & post fields to an article in dummy app
  Button New in header hidden on edit view of model
  Removed new page button from header in pages views
  Use input_width variable to size input-group
  Documented input_group module
  Prepend / append placeholder to input
  Requires Vimeo markdown handler by default
  Added Vimeo markdown handler (same as in haraway branch)
Block robots on .a.mrhenry.eu hosts
Merge pull request #79 from pieterbeulque/feature/meta-robots

Block robots on .a.mrhenry.eu hosts