Version 0.1.75

* Deep changes in server core, emulated module.exports in handlers
running in sandboxes using runInNewContext, this made possible to
implement issue #87
* Implemented optional preloading application from disk to memory
(/config/application.js "preload": true/false), close #84
* Warning: if you use client.hostDir in application, you need to change
it to application.hostDir