Generated import paths can sometimes be simplified

[cexbrayat]

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request

Versions.

ng 1.1.0-beta.0

Repro steps.

ng g m hello
ng g s hello2 -m hello/hello.module

generates a new module and a new service with this import:

import { Hello2Service } from './../hello2.service';

which could be simplified in

import { Hello2Service } from '../hello2.service';

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