Version 0.2.1

• add spec for rpm building

Version 0.2.0

• add SystemD module for linux daemon
• process of loading modules was reorganized

Version 0.1.4

• add pilot version of SystemD linux daemon

Version 0.1.3

• Move helper methods outside

Version 0.1.2

• Corrected some typos

Version 0.1.1

• Add the daemon example of echo service

Version 0.1.0

• Initial version of Go (golang) daemon