Stop mspointer events

Stop mspointerup and mspointerdown events reaching the "stop event" overlay container.
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.
Merge pull request #1150 from tschaub/bing

Use permanent Bing Maps API key.
Some additions to View2d docs
[ci skip]
Merge pull request #1151 from probins/viewdocs

Some additions to View2d docs
Export ol.extent.createEmpty function
Merge pull request #1159 from twpayne/export-create-empty

Export ol.extent.createEmpty function
Add default stability level to docs of exported things.
Fix error in map docs
[ci skip]
Merge pull request #1171 from probins/mapdocs

Fix error in map docs.
Merge pull request #1163 from pagameba/doc-stability

Add default stability level to docs of exported things.
Merge pull request #1147 from elemoine/issue-1147

IE 10 Click on popup
Small addition to view2d docs
Merge pull request #1177 from probins/viewdocs

Small addition to view2d docs.
Fix getImageElement calls in canvas and webgl renderer
Merge pull request #1184 from oterral/get_image_element

Fix getImageElement calls in canvas and webgl renderer
Add ol.coordinate.format function

Return a formatted coordinate. Example usage:
  > ol.coordinate.format([0.01 ,12.14], "{x}, {y}", 2)
  "0.01, 12.14"
  > ol.coordinate.format([0.01 ,12.14], "lat: {y} / lon: {x}", 1)
  "lat: 12.1 / lon: 0.0"
Remove opt_precision check in ol.coordinate.format

Default is already 0, see http://www.ecma-international.org/ecma-262/5.1/#sec-15.7.4.5
Better ol.coordinate.* documentation