Fixes build to run with gradle 2.1
Fixes build to run with gradle 2.1

It appears the newer gradle defaults to utf-8 so this commit removes the manual setting of utf8

Fixes: https://github.com/c-a-m/passfault/issues/23

c-a-m/passfault,c-a-m/passfault,c-a-m/passfault,c-a-m/passfault