old_contents: import os
  import buildFirefox
  import buildChrome
  
  os.chdir(os.path.dirname(os.path.abspath(__file__)))
  buildFirefox.run()
  buildChrome.run()
new_contents: import os
  import buildFirefox
  import buildChrome
  
  os.chdir(os.path.dirname(os.path.abspath(__file__)))
  
  filenames = ['header.js', 'guild_page.js', 'core.js']
  with open('tgarmory.js', 'w') as outfile:
      for fname in filenames:
          with open(fname) as infile:
              outfile.write(infile.read())
  
  buildFirefox.run()
  buildChrome.run()
subject: Prepare for file concat build system