Feature/404 banned users

[elmigranto]

Closes #7

So I tried to build this on node 6, node 0.10.33 and node 0.10.48:

• 6 didn't work due to lwip being incompatible with newer versions of NaN;
• 0.10.x didn't work due to someone in pouchdb-server's dependency tree using ES6 const and arrow functions for w/ever reason.

So I removed pouchdb-server. I also wrote own version of HTTP client and not the one from ganomede-users. It specifies 6.x, same as ganomede-base-client.

Otherwise it works.

Do we do anything about avatar uploads? I guess we keep them without ban chek, so offenders can change avatar and request unban?

[elmigranto]

Also, CI complains about missing deployment keys or something like that: