README.md: Update install.sh and octbstack.pc.in references to master
README.md: Update install.sh and octbstack.pc.in references to master

zolkis/iotivity-node,zolkis/iotivity-node,zqzhang/iotivity-node,zolkis/iotivity-node,zqzhang/iotivity-node,zqzhang/iotivity-node,zolkis/iotivity-node,zqzhang/iotivity-node,zqzhang/iotivity-node,zolkis/iotivity-node