Add ol.extent.touches
WMS tiles touching the extent are excluded
WMTS tiles touching the extent are excluded
Merge pull request #1030 from elemoine/touches

Exclude tiles that touches the source extent
Attach key handler to map target
Remove noModifierKeys condition for keyboad zoom

Refs #917. With the key hanler now attached to the map target by default we can remove the noModifierKeys condition for the keyboard zoom interaction. This will prevent the back button shortcut (alt + <back arrow>) to work, but it's ok, the map is focused so it's the one with the highest priority.
Add an "accessible" example
Merge pull request #1001 from elemoine/keyhandler

Don't register for keyboard events on the document
Remove unused goog.requires
Merge pull request #1031 from fredj/unused_requires

Remove unused goog.requires
Add support for layer min/maxResolution
Fix tests for min/maxResolution
Add min-max-resolution example

Show/hide layers depending on current map resolution.