SetPositioning exposition in the API

The method in ol.Overlay is not exposed whereas is equivalent
getter getPositioning is visible in API and documentation.
The PR add a line of description to the documentation and expose
the method
Align pixels when drawing icons or shapes

The floor before setting the transform ensures that we translate by integer pixels for odd and even dimenstions.  The round before drawing the image ensures pixels are aligned.
Fix a bug when frameState is null which occurs in offline mobile devices
Use integers when positioning on the target canvas

This avoids blurred images after view center changes (dx, dy)
and at fractional zoom levels (dw, dh).
Make sure that the event position is correct for touch events

This is a workaround for https://code.google.com/p/closure-library/issues/detail?id=588
Add new condition param to ol.control.DragBox
Do not relay contextmenu events
Do not relay mousemove events
Use jQuery to listen to map mousemove in examples

This commit also removes the click listener, which was used for touch devices. The click listener will be added back when the lib will correctly handle clicks on touch devices.
Emulate click and dblclick on touch devices
Make overlay container stop touchend and mouseup
Vector examples display feature info on click again
Do not relay mouseout events
Unconditonally set the framestate focus
Add missing logo option
Add missing logo option
Add 'do not use' warning to view.setProjection

[ci skip]
Improve handling of error responses from Bing

Previously goog.asserts.assert was used to check that the response was
successful, which are stripped from compiled code.  This commit sets the
ERROR state on the source instead.
Check resources length of first resource set (see #1149)
Use permanent Bing Maps API key

This key is registered for "Not-for-Profit" use by OpenLayers as a project of OSGeo - a 501(c)(4) organization.

See the complete [Terms of Use](http://www.microsoft.com/maps/product/terms.html) under the Eduction or Non-Profit Organization Use section.