Feature/39 migrate to vuejs

[tsneed290]

Short description of what this resolves:

Migrating UI from Angular to Vue

Changes proposed in this pull request:

• UI source moved to /client folder, copied to src/main/resources/static as part of Gradle build

[barryoneill]

This is a pretty big PR, so I'm just going to play with it locally for a while. Getting the same CI failure as Travis, notably:

28 10 2017 21:57:32.710:ERROR [config]: Invalid config file!
  Error: Cannot find module '../../build/webpack.test.conf'
    at Function.Module._resolveFilename (module.js:470:15)
    at Function.Module._load (module.js:418:25)
    at Module.require (module.js:498:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/home/travis/build/SpartaSystems/holdmail/client/test/unit/karma.conf.js:24:21)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.require (module.js:498:17)
    at require (internal/module.js:20:19)
    at Object.parseConfig (/home/travis/build/SpartaSystems/holdmail/client/node_modules/karma/lib/config.js:363:22)
    at new Server (/home/travis/build/SpartaSystems/holdmail/client/node_modules/karma/lib/server.js:56:20)
    at Object.exports.run (/home/travis/build/SpartaSystems/holdmail/client/node_modules/karma/lib/cli.js:280:7)
    at Object.<anonymous> (/home/travis/build/SpartaSystems/holdmail/client/node_modules/karma/bin/karma:3:23)

[tsneed290]

I'll dig into the failure to load the webpack configuration.

[barryoneill]

Ok - I've tested it out locally and it looks good! We'll have to have some followup work on styling, and also making the forward button work again, but I'd prefer not to have such a huge change sitting in a branch, looming over everything else :) Thank you @tsneed290 for all the effort!

[barryoneill]

Also, farewell AngularJS, you won't be missed.