replace instance_var_set with sends
Add more expectations to case-insensitive spec

mostly for hte purposes of development
refactored Dino
renamed dinodex_config -> dino_config
refactored formatter; mostly to add downcase as converter
add spec to test that missing files are skipped over
refactor dinodex + formatter

main focus was on handling cases where the data read in from a file is
nil (file was missing) or empty
use keyword arguments in dinodex.new
refactor Dinodex#search to only accept 1 search criteria