client cannot connect to non-existing namespaces
Fix splice arguments and `socket.rooms` value update in `socket.leaveAll`.

Hat tip @Marreck
Merge pull request #1700 from rase-/fix/rooms

Fix splice arguments and `socket.rooms` value update in `socket.leaveAll`
Merge pull request #1688 from fdellabetta/server_side_namespace

client cannot connect to non-existing namespaces
make CI build faster
Use svg instead of png to get better image quality
Merge pull request #1713 from PeterDaveHello/patch-1

make CI build faster
Merge pull request #1714 from PeterDaveHello/patch-2

Use svg instead of png to get better image quality