Directory of CSVs to DataFrame is broken

[cpcloud]

mkdir test
cd test
$ echo -en "a,b\n1,2\n3,4" > a.csv
$ echo -en "a,b\n1,2\n3,4\n5,6" > b.csv
$ cd ..
$ ipython
In [1]: df = odo('test/*.csv', pd.DataFrame)
KeyError: <class 'odo.directory.Directory(CSV)'>

[cpcloud]

Hm, even though Directory inherits from Chunks since convert doesn't respect inheritance, we need to explicitly define this conversion.