Fix vector map labels

• Fix vector map labels not being rendered with 100% opacity

Fix vectorserverUrl

• Fix vectorserverUrl option was never returning the image
• Change equal default zoom for vector and raster tiles

Change commonjs to nodejs modules

• Breaking: Change commonjs to nodejs modules
• Upgrade all dependencies to latest versions
• Fix imagemin missing binary
• Change oxipng compression to level 0

Better dependencies pinning

• Uningnored package-lock.json to better pin dependencies

Improve speed

• Speed up results:
  • Add cache to resolve faster tilesets in sample-server
  • Correct default tile url to use https to avoid redirection
  • Remove unnecessary network wait. Change it to wait for map load event
  • Remove tile fade-in effect to be able to resolve earlier
• Upgrade all dependencies to latest versions
• Removed not-working heroku demo
• Removed validation that broke the /dynamic endpoint