Do not auto-detect DSL methods as method objects if parameter name is…

… not a valid method name

Backports and closes #464, referencing #467

lib/yard/handlers/ruby/macro_handler_methods.rb

@@ -82,6 +82,7 @@ def method_name
           name = nil if name =~ /\A\s*\Z/
           name ||= call_params.first
           return unless name
+          return unless name =~ /^#{METHODNAMEMATCH}(\s|\(|$)/
           if name =~ /\A\s*([^\(; \t]+)/
             name = $1
           end

spec/handlers/macro_handler_spec.rb

@@ -154,4 +154,13 @@
     obj.should_not be_nil
     obj.signature.should == 'def beep(a, b, c)'
   end
+
+  it "should not detect implicit macros with invalid method names" do
+    undoc_error <<-eof
+      ##
+      # IMPLICIT METHOD THAT SHOULD 
+      # NOT BE DETECTED
+      dsl_method '/foo/bar'
+    eof
+  end
 end