Merge improvements done by Antoine Catton.

Squashed commit of the following:

commit 275d6e017f06a6a1a038cd1543b3b08f21448178
Merge: 4234290 319c7223
Author: Łukasz Nowak <luke@nexedi.com>
Date:   Thu Sep 8 15:20:10 2011 +0200

    Merge branch 'master' into suggested-improvements

    Conflicts:
    	slapos/recipe/build.py

commit 42342905ad325eefa921de1bc814dd74505ea131
Author: Antoine Catton <acatton@tiolive.com>
Date:   Thu Sep 8 15:12:11 2011 +0200

    Minor: use shlex to parse patch options

commit 7994dcc87afd528ea405c57e2c441b9424018863
Author: Antoine Catton <acatton@tiolive.com>
Date:   Thu Sep 8 15:11:21 2011 +0200

    Buxfix: the patch wasn't send in stdin

commit ee8f324921c7675c764f1c1e05eecf4c1da225f7
Author: Antoine Catton <acatton@tiolive.com>
Date:   Thu Sep 8 12:04:22 2011 +0200

    Use shlex to split command line

slapos/recipe/build.py

@@ -28,6 +28,7 @@ import logging
 import os
 from platform import uname
 import setuptools
+import shlex
 import shutil
 import subprocess
 import tempfile
@@ -86,7 +87,14 @@ def call(*args, **kwargs):
 
 def calls(call_string, **kwargs):
   """Subprocesser caller which allows to pass arguments as string"""
-  call(call_string.split(), **kwargs)
+  call(shlex.split(call_string), **kwargs)
+
+def calli(*args, **kwargs):
+  """Subprocesser call wich allow to pass stdin argument"""
+  popen = subprocess.Popen(*args, **kwargs)
+  popen.communicate()
+  if popen.returncode != 0:
+    raise subprocess.CalledProcessError(popen.returncode, ' '.join(args[0]))
 
 
 def guessworkdir(path):
@@ -330,7 +338,7 @@ class Script:
       if patch_options is None:
         patch_options = []
       else:
-        patch_options = patch_options.split()
+        patch_options = shlex.split(patch_options)
       if patch_binary is None:
         patch_binary = 'patch'
       else:
@@ -353,7 +361,7 @@ class Script:
             patch_options = patch_options.split(' ')
           kwargs['stdin'] = open(self.download(patch, md5sum))
           self.logger.info('Applying patch %r' % patch)
-          call([patch_binary] + patch_options, **kwargs)
+          calli([patch_binary] + patch_options, **kwargs)
 
 class Cmmi(Script):
   """Simple configure-make-make-install compatible with hexagonit.recipe.cmmi