Avoid protocol relative URL to support apps using file protocol
Do not delete event and fires doclets
Do not loop through parents

Now that we use the parseComplete event, we walk through all
doclets in the loop anyway.
Take the feature's weight into account
Add new 'weight' option to ol.layer.Heatmap
Clamp opacity value to (0, 1)
Better documentation for weight option
Remove unneeded json.js extern
Merge pull request #1909 from fredj/extern

Remove unneeded json.js extern
Clean up

Only mark symbol as unexported when it is not in the API, and
no longer extract links from fires annotations because all links
are handled now.
Use a more visually appealing margin for descriptions
Merge pull request #1906 from ahocevar/fix-event-docs

Do not delete event and fires doclets
Update links to W3C specs
Merge pull request #1910 from fredj/api-links

Update links to W3C specs in doc
Merge pull request #1897 from tschaub/absolute

Don't use protocol relative URLs.
Merge pull request #1894 from fredj/heatmap-weight

Take the feature's weight into account
Add a style for selected features
Add condition for selection
Always toggle selection
Add click event as responsive alternative to singleclick

The singleclick event makes the application feel slow because
of the 250 ms delay that is used to rule out a dblclick.