Added support ubuntu 15.
Added support ubuntu 15.

jklepp-tgm/aerospike-client-nodejs,tonypujals/aerospike-client-nodejs,jklepp-tgm/aerospike-client-nodejs,aerospike/aerospike-client-nodejs,aerospike/aerospike-client-nodejs,jklepp-tgm/aerospike-client-nodejs,tonypujals/aerospike-client-nodejs,aerospike/aerospike-client-nodejs,aerospike/aerospike-client-nodejs,jklepp-tgm/aerospike-client-nodejs,jklepp-tgm/aerospike-client-nodejs,tonypujals/aerospike-client-nodejs,tonypujals/aerospike-client-nodejs,tonypujals/aerospike-client-nodejs,aerospike/aerospike-client-nodejs