This fix indentation in exceptions
Merge pull request #383 from r-gaia-cs/fix-exception

Fix indentation in Exceptions lesson
Markdown version of spatial intro
Merge pull request #386 from gvwilson/adding-markdown-for-spatial-intro

Markdown version of spatial intro
Merge branch 'master' into removing-unwanted-novice-extra-material
Incorporating @amyrbrown's edits to novice extra material