BBOX strategy doesn't allow projectionless layers

this patch adds support for them by safeguarding calls to `this.layer.projection`
Do not manage tiles from singleTile layers
Merge pull request #1301 from fbuchinger/patch-4

BBOX strategy doesn't allow projectionless layers
Update Events.js

fix map freezes when dragging the map event the finger moves outside of the map in IE10 on Win8. #1290
Merge pull request #1307 from kou2014/patch-1

Update Events.js
Add missing opening curly brace.
Merge pull request #1308 from marcjansen/bbox-missing-brace

Add missing opening curly brace.
Merge pull request #1304 from ahocevar/no-singletile-queue

Do not manage tiles from singleTile layers