Make baseUrl works in angular-cli

[AlBlanc]

Please provide us with the following information:

1. OS? Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?)
   It doesn't matter
2. Versions. Please run ng --version. If there's nothing outputted, please run
   in a Terminal: node --version and paste the result here:
   angular-cli: local (v1.0.0-beta.11-webpack.8, branch: master) node: 6.2.1 os: darwin x64
3. Repro steps. Was this an app that wasn't created using the CLI? What change did you
   do on your code? etc.
   Just create an app. Set baseUrl to "." in tsconfig.json
4. The log given by the failure. Normally this include a stack trace and some
   more information.
   It does not find the import
5. Mention any other details that might be useful.
   Not sur i should post this improvement here but Typescript 2.0 introduces baseUrl options which allow absolute imports.
   It would be really appreciated to include it in angular-cli.

Update: This PR might help. And apparently, baseUrl was introduced in TS1.9

[serhiisol]

https://github.com/Microsoft/TypeScript/wiki/What%27s-new-in-TypeScript#module-resolution-enhancements-baseurl-path-mapping-rootdirs-and-tracing

this is documentation about baseUrl.

It would be nice to have this option working instead of having something like: ../../../../../shared if you need that

[ghost]

Already raised here: #1465

[filipesilva]

Dupe of #1465

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