Testing image inserting

Just testing to see how inserting images works IF the images are stored
in a sub folder of the specific extension folder (with relative path)
Added in the 'getting started' docs

The 'getting started' docs are the ones that all users should be
familiar with before using any ZOOlander element - they are common to
all (or almost all) elements.
This is the initial content post of these.
(Once these are OK and you let me know about the process of adding
images I'll update these with images.
Merge pull request #1 from cpaschen/gh-pages

Does this work for images? (stored in 'images' sub-directory of each element's folder)