Test Unit using float multiplier

Improve string randomization. Use Capybara table selectors.

lib/core_ext/x_path/d_s_l/normalize_space_default.rb

@@ -0,0 +1,8 @@
+module CoreExt::XPath::DSL::NormalizeSpaceDefault
+  def normalize_space(...)
+    Capybara.default_normalize_ws ? super : current
+  end
+
+  alias_method :n, :normalize_space
+  alias_method :normalize, :normalize_space
+end