Squashed commit of the following:

commit 84ba2ed3e992a82d9e276d9d971724833a4e48c1
Author: Angus Mak <angus.mak@lullabot.com>
Date:   Tue Jun 23 14:45:45 2015 -0400

    Encourage matching the registry key to the bundle name, or entity_type if there is no bundle name

commit 9a9ea118a6e9316d00f9556556c9989ce9b37c9d
Author: Angus Mak <angus.mak@lullabot.com>
Date:   Tue Jun 23 14:39:50 2015 -0400

    Double escape class in the documentation

commit ec139cddf1dd6c32efbd0c6b267e2133a94d46a8
Author: Angus Mak <angus.mak@lullabot.com>
Date:   Tue Jun 23 14:38:04 2015 -0400

    Fix hook documentation

commit b104cede
Author: Mateu Aguiló Bosch <mateu@lullabot.com>
Date:   Mon Jun 22 09:22:11 2015 +0200

    Update Travis badge