Stabilise entries in documentation.

setup.py

@@ -7,7 +7,7 @@ name = 'slapos.cookbook'
 long_description = open("README.txt").read() + "\n" + \
     open("CHANGES.txt").read() + "\n"
 
-for f in glob.glob(os.path.join('slapos', 'recipe', 'README.*.txt')):
+for f in sorted(glob.glob(os.path.join('slapos', 'recipe', 'README.*.txt'))):
   long_description += '\n' + open(f).read() + '\n'
 
 # extras_requires are not used because of