Issue/665 comment detail notification message

Fix #665 - comment detail now shows the notification subject when called from the notification list, and the title of the post when called from the comment list. Tapping this title area opens the associated post in the native reader.

![device-2014-01-10-121541](https://f.cloud.github.com/assets/3903757/1889485/81729e24-7a1c-11e3-9640-b9afb4a5542d.png)