Add ol.structs.LRUCache
Port ol.TileCache to ol.structs.LRUCache
Port WebGL texture cache to ol.structs.LRUCache
Remove ol.structs.LinkedMap
Check sooner and only assert if duration hasn't passed
Use an object literal rather than a class for LRUCache entries
Rename object properties so compiler can rename them
Merge pull request #176 from twpayne/lru-cache

LRU Cache
Remove unnecessary undercores, thanks @fredj
Replace ol.animation.createSpin with ol.animation.createRotateFrom
Merge pull request #181 from fredj/rotation-anim

Replace ol.animation.createSpin with ol.animation.createRotateFrom
Remove unused and erroneous function, thanks @tschaub