fix some jshint issues and ignore others
Be strict
Fix all jshint issues for the preview and move to separate js file for jshinting convenience
More style bothering
Merge pull request #59 from leaflet-extras/more-jshint

More style bothering
Use single-quote for tileurl and tab, like Leaflet codebase
Merge pull request #61 from leaflet-extras/preview-consitancy

Use single-quote for tileurl and tab, like Leaflet codebase
Merge branch 'master' of github.com:leaflet-extras/leaflet-providers into gh-pages

Conflicts:
	index.html