Make IPython extension completely optional. If loading fails, include the error in the warning message.
Make IPython extension completely optional. If loading fails, include the error in the warning message.

Tasignotas/topographica_mirror,mjabri/topographica,ioam/topographica,mjabri/topographica,Tasignotas/topographica_mirror,mjabri/topographica,Tasignotas/topographica_mirror,ioam/topographica,mjabri/topographica,Tasignotas/topographica_mirror,ioam/topographica,mjabri/topographica,ioam/topographica,Tasignotas/topographica_mirror,ioam/topographica