New "Blank Fragment" ADT template.

This change adds a new Blank Fragment template in the 'other'
category, that creates an empty Fragment class with the option of
generating some commonly used boilerplate code such as fragment
factory methods, interface callbacks and an empty layout xml.

Change-Id: I4c68b9ddb6f7915ca8e75b2c6372664d39e216f5
7 files changed