I looked into 60ed5145 and discovered that Capybara::Query#initialize escapes
options[:text]. I think this is a bit confusing, and it messes up the error
message, so options[:text] is now escaped on the fly in matches_filters?.
Also add tests with blanks in them just to be on the safe side.
We have too many top level files, we have multiple
classes in the same file. This allows us to solve
both problems, while also providing a good place
for the new Capybara::Node::Simple (formerly
Capybara::StringNode)
