Require context bounded

[AliusDieMorietur]

Fix: #34
Now when context created require bounding to this context using closure, when require called in vm it gets value from context with Reflect if it exists.

• tests and linter show no problems (npm t)
• tests are added/updated for bug fixes and new features
• code is properly formatted (npm run fmt)

[tshemsedinov]

Need more tests for nested modules

[AliusDieMorietur]

Require should have ability to work with modules in side files and replace require in there scopre and be binded to context we declared? Something like: require('../module1.js') module1.js: const fs = require('fs');

[tshemsedinov]

Yes, module1 -> require(fs) and even module1 -> require(module2) -> module2 -> require(fs)

[AliusDieMorietur]

Due to misclick lost conrtol on old repo, so this PR will be closed and created new #58