add license info to gem spec as bf4 suggested
add license info to gem spec as bf4 suggested

warnergodfrey/eb_deployer,nitheeshp/eb_deployer,ThoughtWorksStudios/eb_deployer,ibnc/eb_deployer,mefellows/eb_deployer,ibnc/eb_deployer,mefellows/eb_deployer,warnergodfrey/eb_deployer,ThoughtWorksStudios/eb_deployer,nitheeshp/eb_deployer