Rewrite api loader

[tshemsedinov]

To be compatible with Metarhia api, example: https://github.com/metarhia/Example/tree/master/application/api

[tshemsedinov]

Here is pure node.js loader implementation: metatech-university/NodeJS-Pure#3

[tshemsedinov]

Fixes in RPC call from ws transport.
Refs: metatech-university/NodeJS-Pure#4

[JekRock]

Please assign this issue to me