fix broken augeas command for missing records.config entries

proxy.config.reverse_proxy.enabled has been removed from the standard
records.config. If we want to make sure that the entry is created
correctly, we need to over-specifiy it in cases where it still exists.
more ignorance
fully qualify trafficserver include

remove dependency for package[trafficserver], this is unreliable anyway,
since after #8
create cache directory + update README