Note some issues I've experienced today.
Change the example test to use numpy arrays, not lists.
A couple of other issues.
Revert "Change the example test to use numpy arrays, not lists."

This reverts commit 5e4180ccc6e9adcccace47dd46cf57dbcf4ca844.
Merge branch 'master' of https://github.com/UCL/ucl_software_carpentry

Resolved conflicting changes to issues.md.
Merge pull request #14 from jonc125/master

Testing numpy and other issues