Update Blueprints.md

Added information on how to override blueprints in a Sails project, taken from https://stackoverflow.com/questions/22273789/crud-blueprint-overriding-in-sailsjs and relevant to #317 and #835.

Also explaining the catch with lowercasing files in /api/blueprints, but maybe this is a bug?
Happens in lib/hooks/blueprints/index.js -> loadMiddleware

      // Merge custom overrides from our app into the BlueprintController
      // in Sails core.
      _.extend(BlueprintController, modules);

BlueprintController contains everything lowercased and modules is camelcased. (But modules already contain a lowercased "identity" property – maybe that can be used for merging?)

Cheers!
M
notice you could query in populate too
Update Upgrading.md
Merge pull request #146 from mphasize/patch-1

Update Blueprints.md with info on overriding controller blueprints
added "importance" and "methodType" docmeta tags
fixed displayName
added plugin section for hooks n stuff
testing github hook
Seems like DESC is the one that works?
testing github hook
Update Cats.md
testing github hook
testing github hook
Merge pull request #154 from AlmaasAre/patch-1

Seems like DESC is the one that works?
Update Generators.md
more plugins docs
more plugins docs
more plugins docs
Update README.md
more plugins docs