Fix bad URI(is not URI?): PlanningRegisterDetails.aspx?id=0042/11 - 2 (URI::InvalidURIError)

Fixes
```
Successfully built d7971676bd3f
 /app/vendor/ruby-1.9.3/lib/ruby/1.9.1/uri/generic.rb:1202:in `rescue in merge': bad URI(is not URI?): PlanningRegisterDetails.aspx?id=0042/11 - 2 (URI::InvalidURIError)
	from /app/vendor/ruby-1.9.3/lib/ruby/1.9.1/uri/generic.rb:1199:in `merge'
	from scraper.rb:18:in `block in <main>'
 	from /app/vendor/bundle/ruby/1.9.1/gems/nokogiri-1.5.0/lib/nokogiri/xml/node_set.rb:239:in `block in each'
	from /app/vendor/bundle/ruby/1.9.1/gems/nokogiri-1.5.0/lib/nokogiri/xml/node_set.rb:238:in `upto'
	from /app/vendor/bundle/ruby/1.9.1/gems/nokogiri-1.5.0/lib/nokogiri/xml/node_set.rb:238:in `each'
	from scraper.rb:16:in `<main>'
```