Added support for dot "." in user mention regex.
Added support for dot "." in user mention regex.

hurie/thebuggenie,LogosLabs/thebuggenie,deshion/thebuggenie,milkyway-git/thebuggenie,thebuggenie/thebuggenie,Rvanlaak/thebuggenie,Rvanlaak/thebuggenie,JonathanRH/thebuggenie,milkyway-git/thebuggenie,JonathanRH/thebuggenie,SamMousa/thebuggenie,azaghal/thebuggenie,thebuggenie/thebuggenie,nrensen/thebuggenie,azaghal/thebuggenie,LogosLabs/thebuggenie,hurie/thebuggenie,SamMousa/thebuggenie,Rvanlaak/thebuggenie,gabor-udvari/thebuggenie,SamMousa/thebuggenie,thebuggenie/thebuggenie,nrensen/thebuggenie,JonathanRH/thebuggenie,praveenscience/thebuggenie,gabor-udvari/thebuggenie,Rvanlaak/thebuggenie,thebuggenie/thebuggenie,LogosLabs/thebuggenie,praveenscience/thebuggenie,nrensen/thebuggenie,gabor-udvari/thebuggenie,thebuggenie/thebuggenie,deshion/thebuggenie,hurie/thebuggenie,milkyway-git/thebuggenie,azaghal/thebuggenie,deshion/thebuggenie,praveenscience/thebuggenie,nrensen/thebuggenie,hurie/thebuggenie,SysBind/thebuggenie,JonathanRH/thebuggenie,milkyway-git/thebuggenie,azaghal/thebuggenie,SysBind/thebuggenie,SysBind/thebuggenie,SamMousa/thebuggenie,SysBind/thebuggenie,gabor-udvari/thebuggenie,LogosLabs/thebuggenie,deshion/thebuggenie,praveenscience/thebuggenie