Fix links on status badges, and add gitter badge.
Fix links on status badges, and add gitter badge.

snikulov/nanomsg,krafczyk/nanomsg,linearregression/nanomsg,tempbottle/nanomsg,wirebirdlabs/featherweight-nanomsg,hyperfact/nanomsg,pakozm/nanomsg,pch957/nanomsg,reqshark/nanomsg,wirebirdlabs/featherweight-nanomsg,reqshark/nanomsg,yan97ao/nanomsg,nirs/nanomsg,featherweight/ftw-kernel-nanomsg,JackDunaway/featherweight-nanomsg,tempbottle/nanomsg,modulexcite/nanomsg,pch957/nanomsg,wirebirdlabs/featherweight-nanomsg,krafczyk/nanomsg,snikulov/nanomsg,JackDunaway/featherweight-nanomsg,zerotacg/nanomsg,cosin2008/nanomsg.NET,zerotacg/nanomsg,pakozm/nanomsg,potatogim/nanomsg,imp/nanomsg,hyperfact/nanomsg,simplestbest/nanomsg,linearregression/nanomsg,cosin2008/nanomsg.NET,simplestbest/nanomsg,simplestbest/nanomsg,JackDunaway/featherweight-nanomsg,yan97ao/nanomsg,imp/nanomsg,modulexcite/nanomsg,yan97ao/nanomsg,imp/nanomsg,cosin2008/nanomsg.NET,nirs/nanomsg,potatogim/nanomsg,thisco-de/nanomsg,krafczyk/nanomsg,featherweight/ftw-kernel-nanomsg,linearregression/nanomsg,reqshark/nanomsg,pakozm/nanomsg,modulexcite/nanomsg,thisco-de/nanomsg,potatogim/nanomsg,hyperfact/nanomsg,nirs/nanomsg,zerotacg/nanomsg,pch957/nanomsg,tempbottle/nanomsg