* Modified getCodeFiles to accept a file filter callback

* Declaration miner

Also added a declarationInfo function in sdk-codegen for looking up a
declaration and creating a permalink

* Fixed section bug in NodeSettings

Prior to this, the section constructor argument was not being saved

* mineDeclarations script

This is for mining a ruby codebase for method/type declarations. It requires defining a Miner section in looker.ini and setting base_url as the relative path to the codebase

* added mine:declarations script in package.json

Also renamed mine to mine:examples

yarn:mine now runs both the example and declaration miners