Use ol.TileCoord.createOrUpdate function
Add @struct annotation to ol.TileCoord class
add ol.source.MapQuestHybrid and add all MapQuest types to the example
use a single ol.source.MapQuest and use a const for the tile attribution
update all the other examples that used MapQuest
Merge pull request #1487 from fredj/cleanup

ol.TileCoord: add @struct annotation and use the ol.TileCoord.createOrUpdate function
Merge pull request #1486 from bartvde/mapquest-hybrid

add hybrid layer to ol.source.MapQuest (r=@twpayne)
Create 'type' annotation for 'const' variables

From https://developers.google.com/closure/compiler/docs/js-for-compiler:
  "The type declaration and additional comment are optional. If you
  provide a type declaration, put the declaration on a separate line."
Add 'const' annotation to ol.MapBrowserEvent.browserEvent
Merge pull request #1491 from fredj/const-annotation

Create 'type' annotation for 'const' variables