Merge pull request #1 from giannidallatorre/master

Added link to myproxy_server container
Start & stop myproxy-server
Fixed typo
Jenkins slave boostrap script
Merge branch 'master' of github.com:andreaceccanti/ci-scripts

* 'master' of github.com:andreaceccanti/ci-scripts:
  Fixed typo
  Start & stop myproxy-server
  Added link to myproxy_server container
Show command execution in start-slave script