Fix install failures
Fix install failures

- Use pytables from defaults
- Pin conda
- Use `conda list` to give better debug support

dask/dask,jcrist/dask,ContinuumIO/dask,jcrist/dask,mrocklin/dask,ContinuumIO/dask,jakirkham/dask,blaze/dask,blaze/dask,dask/dask,mrocklin/dask,jakirkham/dask