[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/setup.py

@@ -8,3 +8,4 @@ def getdata():
     tmpdir = py.test.ensuretemp(rel.replace(pydir.sep, '_'))
     mydatadir.copy(tmpdir)
     return tmpdir
+