Add homepage to gemspec.
Add homepage to gemspec.

Shopify/poseidon,apptentive-engineering/poseidon,airbnb/poseidon,ListenFirstMedia/poseidon,nepalez/poseidon,codeclimate/poseidon,bpot/poseidon,SponsorPay/poseidon,chingor13/poseidon,Tapjoy/poseidon,gjackson12/poseidon