Clean up JSON Schema Compiler.

tools/json_schema_compiler/preview.py

Index: tools/json_schema_compiler/preview.py
diff --git a/tools/json_schema_compiler/preview.py b/tools/json_schema_compiler/preview.py
index 22ed0f2df9f84db99ab1f61be21ddf1cf2e821c1..5c5fee084bac400572f50e86468aa042ecf74630 100755
--- a/tools/json_schema_compiler/preview.py
+++ b/tools/json_schema_compiler/preview.py
@@ -8,7 +8,6 @@
 
 import cc_generator
 import code
-import compiler
 import cpp_type_generator
 import cpp_util
 import h_generator
@@ -18,12 +17,12 @@ import model
 import optparse
 import os
 import schema_loader
-import sys
 import urlparse
 from highlighters import (
     pygments_highlighter, none_highlighter, hilite_me_highlighter)
 from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
 
+
 class CompilerHandler(BaseHTTPRequestHandler):
   """A HTTPRequestHandler that outputs the result of tools/json_schema_compiler.
   """
@@ -327,6 +326,7 @@ updateEverything();
 
     return html.Render()
 
+
 class PreviewHTTPServer(HTTPServer, object):
   def __init__(self, server_address, handler, highlighters):
     super(PreviewHTTPServer, self).__init__(server_address, handler)