Removed incorrect methods from rx.time.d.ts and updated header;
Extracted common part of defintitions of rx.time.d.ts and rx.lite.d.ts into rx.time-lite.ts.
Extracted common part of definitions of rx.backpressure.d.ts and rx.lite.d.ts into rx.backpressure-lite.ts.
Added rx.lite.d.ts with reference to all common parts with other modules and specific methods.