Change PyPI author from Enrico to David Ressman

Just to keep Enrico from getting support requests he no longer wants.

Author: davidr

setup.py

@@ -27,8 +27,8 @@
     version="0.6",
     packages=packages,
     package_data=package_data,
-    author="Enrico Sirola",
-    author_email="enrico.sirola@gmail.com",
+    author="David Ressman",
+    author_email="davidr@ressman.org",
     description="a python DRMAA library",
     license="BSD",
     keywords="python grid hpc drmaa",