Add py-csvkit package

This adds the py-csvkit package and needed dependencies for working with
csv files.

var/spack/repos/builtin/packages/py-dbf/package.py

@@ -0,0 +1,17 @@
+from spack import *
+
+class PyDbf(Package):
+    """
+    Pure python package for reading/writing dBase, FoxPro, and Visual FoxPro
+    .dbf files (including memos).
+    """
+
+    homepage = 'https://pypi.python.org/pypi/dbf'
+    url      = "https://pypi.python.org/packages/source/d/dbf/dbf-0.96.005.tar.gz"
+
+    version('0.96.005', 'bce1a1ed8b454a30606e7e18dd2f8277')
+
+    extends('python')
+
+    def install(self, spec, prefix):
+        python('setup.py', 'install', '--prefix=%s' % prefix)