Handle activation/deactivation in draw interaction
Add tests for ol.interaction.Draw#setActive
Add tests for ol.interaction.Draw#setMap
Add an example for using an Esri 512x512 tile server in EPSG:4326
Merge pull request #2756 from bartvde/ESRI_Imagery_World_2D

Add an example for using an Esri 512x512 tile server in EPSG:4326 (r=@elemoine)
Fix jquery.min.js path in xyz-esri-4326-512 example
Merge pull request #2815 from fredj/leftover-2756

Fix jquery.min.js path in xyz-esri-4326-512 example
Add ol.Observable.unByKey
Exit on check-examples failure

Should avoid Travis to pass even though there are errors.

Waiting for the check-examples to finish to get all the errors.
It may also be necessary in order to free system resources like file
descriptors.
Merge pull request #2794 from elemoine/unbykey

Add ol.Observable.unByKey
Merge pull request #2816 from gberaudo/exit_on_check_examples_failure

Exit on check-examples failure
Merge pull request #2743 from elemoine/drawinteraction

Handle ol.interaction.Draw activation/deactivation
Add more explanations to xyz-esri-4326-512 example
Fix typo in xyz-esri-4326-512 example
Show how to wrap world in xyz-esri-4326-512 example
Merge pull request #2819 from elemoine/xyz-esri

Improvements to the xyz-esri-4326-512 example
Add OverviewMap control
Add overviewmap example, simple use case
Add overviewmap-custom example, complex use case
Add parsing of LabelStyle in KML format