Ockham's Razor

• The package no longer includes raw *.ts file. Instead, it includes compiled js with d.ts typing file. This decouples users' tsconfig file from the library's own tsconfig file.
• Now supports Typescript >= 3.0.0, Jasmine >= 2.9.0,
• The change is backward compatible, but due to the risk involved in the complete overhaul of the package content (from ts to js), I've chosen a major version bump.