support parameter tileMatrixLabels for custom tilematrix= parameter
remove comments
rm trailing whitespace / jsHint
mark optional parameter as such
use defined, not git add Source/Scene/WebMapTileServiceImageryProvider.js
use defined, not !!
Merge branch 'wmts-fix' of https://github.com/kartverket/cesium into wmts-fix
Merge pull request #2275 from kartverket/wmts-fix

Wmts fix