Add prefix aliasing

Prefix aliasing using AliasedGroup for bob.extension

bob/measure/script/measure.py

@@ -4,10 +4,11 @@ import click
 import pkg_resources
 from click_plugins import with_plugins
 from click.types import INT, FLOAT, Choice, File
+from bob.extension.scripts.click_helper import AliasedGroup
 
 
 @with_plugins(pkg_resources.iter_entry_points('bob.measure.cli'))
-@click.group()
+@click.group(cls=AliasedGroup)
 def measure():
     """Generic performance evaluation commands."""
     pass