v2.9.1

7d87e2f Check root: Password can be empty
16cd06e Modify Check Root Startup
b24ac28 Drop unused code
73f627f Optimize js code by use Vue.set and Vue.delete
d22aec7 Fix init scripts

Precompiled:
rttys-linux-386.tar.gz
rttys-linux-amd64.tar.gz
rttys-windows-386.zip
rttys-windows-amd64.zip