This dep was meant as a stopgap for a patch in the stdlib of Go which I
wrote.
The patch was released in Go 1.7. We can now remove my fork and go back
to the stdlib
The template resources don't actually need to retain any state, so they
are good candidates to be data sources.
This includes a few tweaks to the acceptance tests -- now configured to
run as unit tests -- since it seems that they have been slightly broken
for a while now. In particular, the "update" cases are no longer tested
because updating is not a meaningful operation for a data source.