TokenD client application.

Known issues:

• Some tests are forcing Vue.config.silent flag because of a few annoying warnings, (vuejs/vue-test-utils#532). Remove once migrating to Vue 2.6
• documents module and all it's internals are in draft, may not be released and may not be compatible with other TokenD features.
• Windows support is experimental and has known issues. Set git config --global core.autocrlf false to avoid line endings issues