Fixes name clashes and uses Node-compatible typings where possible.
Changes:
- setTimout et al now return NodeJS.Timer instead of number
- No "console" module anymore. Everyone uses it through global.console
anyway.
- We have a typed "global" instance with exposed properties now. Any
"freeform" accesses must go through a `(<any>global).blah` cast.
- remove tns-core-modules.{base,es6,es2015}.d.ts. Those were needed
as workarounds for the ES6/DOM/Node type clashes.
