Added cleaner in realtime.js, to clean up users which aren't in any rooms in a interval
Added cleaner in realtime.js, to clean up users which aren't in any rooms in a interval

lynnlu/hackmd,Rwing/hackmd,xnum/hackmd,hackmdio/hackmd,lynnlu/hackmd,hackmdio/hackmd,Yukaii/hackmd,ironhack/hackmd,Rwing/hackmd,jackycute/HackMD,aswathyjacob8/newtest,naturezhm/hackmd,janniklorenz/HackMD,jackycute/HackMD,lynnlu/hackmd,PeterDaveHello/hackmd,PeterDaveHello/hackmd,Rory80Hz/hackmd,Rwing/hackmd,Rory80Hz/hackmd,jccrofty30/hackmd,hackmdio/hackmd,Yukaii/hackmd,xnum/hackmd,jccrofty30/hackmd,janniklorenz/HackMD,xnum/hackmd,naturezhm/hackmd,aswathyjacob8/newtest,Rory80Hz/hackmd,jackycute/HackMD,ironhack/hackmd,janniklorenz/HackMD,naturezhm/hackmd,aswathyjacob8/newtest,PeterDaveHello/hackmd,jccrofty30/hackmd,Yukaii/hackmd,ironhack/hackmd