Added Ruby 2.2 to build targets, allows ruby-head to fail
Added Ruby 2.2 to build targets, allows ruby-head to fail

aerospike/aerospike-client-ruby,ook/aerospike-client-ruby,ook/aerospike-client-ruby,redBorder/aerospike-client-ruby,redBorder/aerospike-client-ruby,aerospike/aerospike-client-ruby,bitgaming/aerospike-client-ruby,bitgaming/aerospike-client-ruby