Insights client sdk

<p><a href="https://github.com/Azure/azure-sdk-for-net/pull/760">https://github.com/Azure/azure-sdk-for-net/pull/760</a></p>
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Add output for .NET 4.5
```
<file src="..\binaries\Microsoft.Azure.Insights.dll" target="lib\net45" />
...
```