Add request timeout for 1.8 and 2.x

• #141 increase min width of config edit slightly so that flow context pop up appears to work around possible node-red issue node-red/node-red#4497
• #134 add request timeout configuration for 1.8 and 2.x versions. It's not clear to me how to do this for library used for 1.x version. Default is 10 seconds.
• #128 add license, used Apache-2.0
• #82 add engine spec
• updated dependencies, docker images used for tests