Add gitter links to contributing.md
Add gitter links to contributing.md

also add a little style to some of the existing text.
sandow-digital/slick,dev6-seucondominio/slick,strawmitch/slick,EricHodgins/slick,Tuckie/slick,vuongdothanhhuy/slick,Duske/slick,Duncaen/slick,HagiaSofiya/slick,billybonz1/slick,ethanclevenger91/slick,ilovezy/slick,nestpick/slick,wstoettinger/slick,ceg692001/slick,nyusaf/slick,znsstudio/slick,Kentlol123/slick,wc-matteo/slick,flaviocysne/slick,flaviocysne/slick,BroadwayDev/slick,vuongdothanhhuy/slick,ionut-c/slick,compact/slick,escaped/slick,laurent-bettin/slick,rphelan/slick,palgit/slick,Duske/slick,wc-matteo/slick,yorimontolalu/slick,aciliainternet/slick,xiaoliw7/slick,EricHodgins/slick,Duske/slick,vaartio/slick,kolorowestudio/slick,archang/slick,marvinhuebner/slick,amyash/slick,ixkaito/slick,astericky/slick,prabhuramkumar/slick,UVLabs/slick,amyash/slick,ernestob/slick,Jeremy017/slick,aciliainternet/slick,rsemenyshyn/slick,FluidInc/slick,kelvearagao/slick,prabhuramkumar/slick,ddrevnov/slick,AndBicScadMedia/slick,buithaitruong/slick,joker8999/slick,kenwheeler/slick,chuckienorton/slick,billybonz1/slick,justin-rosecrans/slick,strawmitch/slick,DouglasMartin/slick,kenwheeler/slick,modulexcite/slick,EugeneKot/slick,FluidInc/slick,DmitriyTrt/slick,neogis-de/slick,laurent-bettin/slick,kenwheeler/slick,chuckienorton/slick,marvinhuebner/slick,kostakoida/slick,nestpick/slick,compact/slick,nyusaf/slick,Duncaen/slick,vaartio/slick,skotz/slick,xiaoliw7/slick,kuslahne/slick,gitkiselev/slick,UVLabs/slick,bneiluj/slick,davidBearinTokyo/slick,sojimaxi/slick,carrie88/slick,Apreche/slick,BroadwayDev/slick,carrie88/slick,b-cuts/slick,paggel/slick,kev-mc/slick,joker8999/slick,goranefbl/slick,Jako/slick,kevinrodrigues/slick,wc-matteo/slick,btpoe/slick,Kentlol123/slick,cielt/slick,tyleraadams/slick,buithaitruong/slick,rphelan/slick,hemusyl/slick,ernestob/slick,justin-rosecrans/slick,kelvearagao/slick,bneiluj/slick,CapeSepias/slick-1,skotz/slick,modulexcite/slick,bartvde/slick,sojimaxi/slick,yakupme/slick,madhav5589/slick,christophgreggersen/slick,SalahAdDin/slick,laantorchaweb/slick,odie2/slick,simeydotme/slick,HagiaSofiya/slick,valentinvoilean/slick,davidBearinTokyo/slick,melbournevijay/slick,kuslahne/slick,paggel/slick,Apreche/slick,sandow-digital/slick,astericky/slick,kolorowestudio/slick,alexuson/slick,ixkaito/slick,Jako/slick,Jeremy017/slick,AntoineBoulanger/slick,sky-uk/slick,vyacheslav-lonschakov/slick,flaviocysne/slick,CapeSepias/slick-1,prabhuramkumar/slick,znsstudio/slick,AntoineBoulanger/slick,HellSquirrel/slick,odie2/slick,rsemenyshyn/slick,laantorchaweb/slick,escaped/slick,routard/slick,EugeneKot/slick,yorimontolalu/slick,sky-uk/slick,vyacheslav-lonschakov/slick,cielt/slick,yorimontolalu/slick,hemusyl/slick,localpcguy/slick,b-cuts/slick,HellSquirrel/slick,markvantilburg/slick,ionut-c/slick,routard/slick,christophgreggersen/slick,localpcguy/slick,cielt/slick,palgit/slick,goranefbl/slick,valentinvoilean/slick,melbournevijay/slick,marvinhuebner/slick,SalahAdDin/slick,simeydotme/slick,ilovezy/slick,madhav5589/slick,kevinrodrigues/slick,gitkiselev/slick,ddrevnov/slick,dftdp/slick,dev6-seucondominio/slick,web-busters/slick,markvantilburg/slick,wstoettinger/slick,web-busters/slick,DouglasMartin/slick,AndBicScadMedia/slick,kostakoida/slick,tyleraadams/slick,aciliainternet/slick,Tuckie/slick,ethanclevenger91/slick,kev-mc/slick,neogis-de/slick,bartvde/slick,dftdp/slick,alexuson/slick,archang/slick,yakupme/slick,btpoe/slick,ceg692001/slick