Segmentation fault with PySide

[astrofrog]

One of the issues I ran into when debugging #768 is that on PySide (on Mac), I get a segmentation fault when opening a new viewer.

To reproduce:

conda create -n test python=2.7 glueviz
conda remove pyqt sip
conda install pyside

then create a Python script with

import numpy as np
from glue import qglue
qglue(x=np.random.random((100,100)))

Run it, then drag the dataset onto the main area and make an imagewidget. This gives a segmentation fault.

gdb shows the following error:

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000008
0x0000000105d820fd in QVariant_isStringList ()

EDIT: need to also install the latest developer version of glue once the conda environment is set up

[astrofrog]

Fixed in #755