[Checkins] [zopefoundation/grokcore.site] 753ab5: Advertise the install_on directive

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/grokcore.site
  Commit: 753ab59b94fdf300e77dfa1788f46baa837e8493
      https://github.com/zopefoundation/grokcore.site/commit/753ab59b94fdf300e77dfa1788f46baa837e8493
  Author: Sylvain Viollon <thefunny at gmail.com>
  Date:   2015-06-04 (Thu, 04 Jun 2015)

  Changed paths:
    M src/grokcore/site/interfaces.py

  Log Message:
  -----------
  Advertise the install_on directive