Comment out the PyPy build and only install psycopg2ct on PyPy.
Comment out the PyPy build and only install psycopg2ct on PyPy.

There's something funny with the PyPy installation at Travis CI, so
take it out for the time being. On the other hand, we only need to
install psycopg2ct on PyPy, so configure the build to do so.

wulczer/txpostgres