options.allowreauth fix, updates

Changes

• config.reauth was not respected if initial auth presented was incorrect, regardless of reauth setting in config.json reauth would always be attempted. fixes #117
• BREAKING moved app files to /app, this may be a breaking change
• Updated dockerfile for new app path
• Updated app dependancies
  • xterm v3.8.0
    • https://github.com/xtermjs/xterm.js/releases/tag/3.8.0
  • basic-auth v2.0.1
    • https://github.com/jshttp/basic-auth/releases/tag/v2.0.1
  • express v4.16.4
    • https://github.com/expressjs/express/releases/tag/4.16.4
  • validator v10.9.0
    • https://github.com/chriso/validator.js/releases/tag/10.9.0
• Updated dev dependancies
  • snazzy v8.0.0
  • standard v12.0.1
  • uglifyjs-webpack-plugin v2.0.1
  • ajv v6.5.5
  • copy-webpack-plugin v4.6.0
  • css-loader v1.0.1
  • nodemon v1.18.6
  • postcss-discard-comments v4.0.1
  • snyk v1.108.2
  • url-loader v1.1.2
  • webpack v4.25.1
  • webpack-cli v3.1.2