Automattic/jetpack — pull request #542 by kraftbj (2014-05-15 02:57:06+00:00)
Title: Adds notice to Jetpack page describing trigger for JP Development Mode.

When Development Mode is enabled, it can be confusing to users who are not expecting/aware of this feature of Jetpack. This PR adds a notice to the Jetpack page informing that Development Mode is enabled as well as what trigger (JETPACK_DEV_DEBUG, a filter, site URL) enabled it.