Fixes error for puts <number>

error: String can't be coerced into Fixnum (TypeError)

lib/kidsruby/stdio.rb

@@ -9,9 +9,9 @@ def write(data)
     t = data.gsub(/\n/,"<br/>")
     @iface.call("append", t)
   end
-  
+
   def puts(data)
-    write(data + "\n")
+    write(data.to_s + "\n")
   end
 end
 
@@ -30,4 +30,4 @@ def puts(data)
 $stdout = StdOut.new
 
 $stderr.sync = true
-$stderr = StdErr.new
+$stderr = StdErr.new

spec/models/std_io_spec.rb

@@ -0,0 +1,13 @@
+require_relative "../spec_helper"
+require_relative "../../lib/kidsruby"
+
+describe StdOut do
+  describe ".puts" do
+    it "should delegate the coerced, new-lined data to .write" do
+      stdout_ut = StdOut.new
+      stdout_ut.expects(:write).with("123\n")
+      stdout_ut.puts(123)
+    end
+  end
+end
+