x13as 1.1.9 (new formula)

X-13ARIMA-SEATS is a seasonal adjustment software produced, distributed, and maintained by the Census Bureau.

http://www.census.gov/srd/www/x13as/

I used `bin.install` since the very simple `make install` provided was failing.
Can this test be added to do something more substantial then e.g. `--version` or `--help`? See `cmake.rb` for an example of a formula with a good test. Thanks!