partial re-wording of README for legibility. Added draft section on arrays.
italicised 'wisp' for readability
fixed errant replace
fixed another errant search
Covered all (I think) of @Gozala's comments, moving on to more tweaks
most text revised, done by now (will wait for further comments)
Merge pull request #72 from rcarmo/feature/doc-fixes

Feature/doc fixes