Final tweak for pics
Initial definition of picable
Picable working on recipes and sites
Recipe functioning as Linkable
Recipe functioning as Linkable
Committing migrations
Recipe and Image Reference creation in creating recipes; also, fixed image picking in injector,  made Linkable attribute names into class variables for inheritance, converted strings of whitespace into a single blank in titles, and made urls be unique within Reference type.
Linkable now defines an accessor for the url field, using the original, direct attribute if no reference can be found
Reference deferral works except for finding method
class method 'site' works for linkable
Sorted out class variables for Linkable module
Def. of key_linkable vs. linkable; preliminary dev. of SiteReference (saved from Sites and matched by_link)
References now in place and getting serviced
Continuing progress toward robust Reference handling
Changed pic able to work on belongs_to association
Putting it to bed. Working on merging recipes
Correctly saving thumbnail data in converting to reference; also, resorting to http protocol when https fails in testing a link
picable gets thumbnail data successfully
Database stable, defined Reference#fetch to get data in the face of redirects and https requests
Dropped LinkRefs table