Maintenance release

1.2.0 (2017-09-24)

• (bluefox) fixed upgrade command
• (bluefox) allow install from custom repositories
• (bluefox) remove online and sources repositories
• (bluefox) fix multihosts command
• (bluefox) catch the error outputs of instances if they die
• (bluefox) no more support for node.js 0.10/0.12
• (bluefox) add new logging level: silly