Remove publish_www and simplify www_touched

Because of I2f0c61006ef8885e157eb2b800080407f2bae393 it is not
longer necessary to publish the files inside the www directory.

Because of the removal of publish_www it's now only necessary
to check if only files inside the www directory are changed.

Change-Id: Ic28ba9251ecb47967de2e7b6816788828e3bbb14
Merge "Remove publish_www and simplify www_touched"