Gant Laborde 85a2d6a65d Add logging level for RNPM previous linking
Summary:
Sometimes when working with a team of developers, someone adds a library but does not link it.  To identify if this required linking, you have to type `react-native link` and then read a wall of text to see if rnpm handled the issue.   This can be sped up with a friendly logging level for previously linked messages.

**This PR turns this:**
![screen shot 2016-08-21 at 11 49 07 am](https://cloud.githubusercontent.com/assets/997157/17838588/84223264-6796-11e6-81d2-075d30942a69.png)

**Into this:**
![screen shot 2016-08-21 at 11 52 31 am](https://cloud.githubusercontent.com/assets/997157/17838592/92c2ce64-6796-11e6-884d-e5af8f4c2b5a.png)

Which is a pretty nice experience!   This also helps you quickly identify when 1 thing wasn't linked, at a glance, like so!
![image](https://cloud.githubusercontent.com/assets/997157/17838613/22568c8c-6797-11e6-8e12-c73746ec0eff.png)
Closes https://github.com/facebook/react-native/pull/9507

Differential Revision: D3757516

fbshipit-source-id: e4c691824e9318d36f4c1d89673b7e747fb972f1
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