Add wmts-capabilities example
Use correct namespaceURI for WGS84BoundingBox reader

(closes #356)
Add new equivalent projections

for both EPSG:4326 and EPSG:3857.
Fix wmts-capabilities example

the parsing of the wmts getCapabilities document require proj4js.

Also initialize common ol3 projections with ol.projection.addCommonProjections
so that it won't try to get EPSG:3857 from proj4js.
The same projection can be added more than once

So that addCommonProjections can be safely called in our examples.
Add exportSymbol for ol.projection.addCommonProjections
Update social links in wmts-capabilities example
Add png output
Use jsdoc v3.1.1
Merge pull request #408 from elemoine/jsdoc311

Use jsdoc v3.1.1
Minor jsdoc fix
Merge pull request #403 from fredj/export-map

Add png output
Merge pull request #411 from fredj/apidoc

Minor jsdoc fix
Merge pull request #356 from bbinet/issue-356

Can't parse http://maps.wien.gv.at/wmts/1.0.0/WMTSCapabilities.xml
Tile renderers needn't listen for tile change
crossOrigin defaults to null
Merge pull request #407 from elemoine/crossorigin

crossOrigin defaults to null
ArcGis use RESTful

The OGC documentation is not clear if we should use REST or RESTful.
ArcGis use camelcase 'Style', not lowercase 'style'

The OGC documentation is not so clear if we should use style or Style.
Use Vienna wmts in wmts-from-capabilities example

vienna wmts capabilities url is:
http://maps.wien.gv.at/wmts/1.0.0/WMTSCapabilities.xml