Minor trello roadmap.  GS and GH search for new issues.  #96

Both GH and Gs have a _newer_issues funciton that.  It works like the search function but also uses a parameter to restrict results to items with an id above a specified value.  Since ids are sequential, this gives us only the newest results and we only have to track one number per data source.

Incidentally I'm using php closures here.  I found them surprisngly likable.  ` function($i) use ($id) {return ($id < $i['number']);}`.  I would never have found `use` in the php docs, but it was in a few examples.  It let me include that $id var into the scope of the anonmymous function.  Clean.