Add jonnor/noflo-cad to HTML preview runtime

Allow user to make parametric 3d models directly in the browser,
with live preview.
Merge pull request #121 from jonnor/add-noflo-cad

Add jonnor/noflo-cad to HTML preview runtime
Always compress
Some fixes for Chrome App packaging
Flowhub logo for unauthenticated users
Disable autolayout until it works in Chrome Apps, refs #53
Ignore local helper scripts
Only enable autolayout button if Klay is available
Make Login button more prominent
Always lint before building
Ensure blur covers UI chrome
Also clear the tokens when user logs out
Implement authentication also in the Chrome App
Merge branch 'master' of github.com:noflo/noflo-ui
Remove noflo-cad dependency until missing files are resolved, refs #121
Cache user avatar locally so it is available also when offline
Allow clearing selected runtime
Make search shortcut work for now