Stop mspointer events

Stop mspointerup and mspointerdown events reaching the "stop event" overlay container.
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
Add jsdoc plugin that maps @todo tags to @stability and @observable tags.

This is a temporary measure until Plovr handles custom tags or is replaced in the build system.

Add support for indicating API stability with inline documentation

In preparation for documenting the stability of API features, this commit adds support for indicating API stability via a new jsdoc tag @stability.  There is a small plugin for jsdoc that adds a new tag, @stabiility, with some ability to enforce specific level names.  The templates and css have been updated to include the stability level in the generated documentation. (+1 squashed commit)
Squashed commits:
[d6bc03d] Add jsdoc plugin for documenting observable properties of a class.
Merge pull request #1180 from pagameba/doc-jsdoc-plugins

Add jsdoc plugins for stability and observables.
Fix `@todo observable` name reference.
Remove unnecessary Get column from observables
Merge pull request #1187 from pagameba/fix-todo-observables

Fix todo observables.
Merge pull request #1185 from fredj/coord_format

Add ol.coordinate.format function
Quote values in apidoc