Fixing the `return code` and remove container after finishing execution  in the shell command. #56
Adding usr/local in path
Fixing error in AgentStartError.
Fixing waitService to consider the maximum number of attempts
Changing stop vm method from poweroff to acpipowerbutton. close #70
Fixing vm spec and adding force option in vm stop. #70
Adding exception handling for problems with docker in shell command. #56
Fixing the mapping disk for “dind” systems.
Update CHANGELOG. close #56
Adding support the `ssh escape sequence` in `shell` command. close #94
Fixing bug in execute `shell` or `start` in offline. close #96
Fixing error in use npm cache. #95
Upgrading README to adding linux install instructions. close #77
Upgrade version 0.5.0