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
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 branch 'master' of https://github.com/openlayers/ol3 into android_touch

Conflicts:
	src/ol/interaction/touchzoominteraction.js