Add py-csvkit package

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

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

@@ -0,0 +1,18 @@
+from spack import *
+
+class PyOpenpyxl(Package):
+    """
+    A Python library to read/write Excel 2007 xlsx/xlsm files
+    """
+    homepage = 'http://openpyxl.readthedocs.org/'
+    url      = "https://pypi.python.org/packages/source/o/openpyxl/openpyxl-2.4.0-a1.tar.gz"
+
+    version('2.4.0-a1', 'e5ca6d23ceccb15115d45cdf26e736fc')
+
+    extends('python')
+
+    depends_on('py-jdcal')
+    depends_on('py-setuptools')
+
+    def install(self, spec, prefix):
+        python('setup.py', 'install', '--prefix=%s' % prefix)