add zk and thrift deps to gemspec
add zk and thrift deps to gemspec

Yelp/synapse,yonglehou/synapse-1,johnmccabe/synapse,dallasmarlow/synapse,gini/synapse,bcicen/synapse,asiragusa/synapse,lsjostro/synapse,airbnb/synapse,jolynch/synapse,EasonYi/synapse,hankya/synapse,bobtfish/synapse,democracyworks/synapse,bobtfish/synapse,StephanErb/synapse,tdooner/synapse,claydotio/synapse,freiheit-com/synapse