View2D option "numZoomLevels" changed to "maxZoom"

This is to be consistent with ol.source.XYZ and ol.tilegrid.XYZ.
More View2D configuration flexibility
maxZoom 18 in localized-openstreetmap example
Fix zoom anchor for touch zoom interaction
Fix rotation anchor for touch rotate interation
Merge pull request #546 from elemoine/view2d

View2D - more consistency and configuration flexibility
Bigger + and - zoom buttons on touch devices
Merge pull request #547 from elemoine/touch-anchor

Anchors are incorrect in touch interactions
setHint returns new hint value
pan interactions call requestRenderFrame on dragend
Add a condition param to the KeyboardPan and KeyboardZoom interactions.

By default, the action is ignored if a modifier key is pressed.
Remove ol.interaction.Keyboard
Merge pull request #549 from elemoine/pan-interaction-fix

Pan interaction fix
Merge pull request #548 from elemoine/zoom-css

Bigger + and - zoom buttons on touch devices
Merge pull request #551 from fredj/ol.interaction.Keyboard

Remove ol.interaction.Keyboard
Merge pull request #550 from fredj/keyboard

Add a condition param to the KeyboardPan and KeyboardZoom interactions.