[svn r58308] * de-generalize conditional skips and only care

nicely for common tedious causes of skipping:
  import a module and checking it has a certain
  version.  usage example:

  docutils = py.test.importorskip(docutils, minversion="0.4")

* used new helper and cleanup skipping logic in py lib

--HG--
branch : trunk

py/rest/testing/test_directive.py

@@ -1,13 +1,10 @@
 import py
-try:
-    import docutils
-except ImportError:
-    py.test.skip("docutils not present")
 
+from py.__.rest.testing.setup import getdata
+docutils = py.test.importorskip("docutils")
 from py.__.rest import directive
 from py.__.misc import rest
 from py.__.rest.latex import process_rest_file
-from py.__.rest.testing.setup import getdata
 
 def setup_module(mod):
     mod.datadir = getdata()