[yt-dev] Issue #838: OffAxisSlicePlot dosen't respect the unit of width (yt_analysis/yt)

[Stuart Mumford]

New issue 838: OffAxisSlicePlot dosen't respect the unit of width
https://bitbucket.org/yt_analysis/yt/issue/838/offaxissliceplot-dosent-respect-the-unit

Stuart Mumford:

I tried to run the `aligned_cutting_plane.py` from the cook book and changing:

```
#!python
p = yt.OffAxisSlicePlot(ds, L, "density", sp.center, (25, "kpc"))
```

to 

```
#!python

p = yt.OffAxisSlicePlot(ds, L, "density", sp.center, (25, "pc"))
```

only resulted in the axis label changing not the view on the data.