facilities extraction:: add: original elskwid gist

https://gist.github.com/elskwid/6532724/raw/ba260e61986415331b696ae9cb3a60ee4445f0ed/washoe_eats.rb
facilities extraction:: rework: CLI script to dump facilities from web -> text

usage:
ruby -Imechanize extract_facilities.rb

tested:
 * ruby-2.0.0-p247
 * mechanize-2.7.2
facilities extraction:: refine (sq)

problem:
at the end of execution, getting:
$ ruby -Imechanize bin/extract_facilities.rb > data/facilities.txt
[...]gems/nokogiri-1.6.0/lib/nokogiri/xml/node_set.rb:214:in `attr': undefined method `attribute' for nil:NilClass (NoMethodError)
        from bin/extract_facilities.rb:235:in `next_page_number'
        from bin/extract_facilities.rb:229:in `call'
        from bin/extract_facilities.rb:218:in `call'
        from bin/extract_facilities.rb:42:in `next_page_number'
        from bin/extract_facilities.rb:33:in `call'
        from bin/extract_facilities.rb:35:in `call'
        from bin/extract_facilities.rb:35:in `call'
facilities extraction:: chg: only run FacilityScraper if it is the main file

allows code to be included/loaded without executing.
facilities extraction:: add: sample data dump output by extract_facilities.rb
facilities extraction:: updated data as of 2013-10-01 1210-0700
facilities extraction:: chg: rename -> '.tsv' file extension