Clearly indicate where dependencies are resolved from in build output

[halter73]

When I modify global.json and run build.cmd, it is unclear whether dependencies are picked up from the new sources referenced in global.json or from nuget.

[glennc]

@ChengTian This is similar to what KPM pack does. Write out all the dependencies in the dependency graph and where we loaded them from. It should be displayed by default and turned off by passing --quiet

We should make pack and build the same, the output could be something like this:

Using {Assembly|Package|Project} dependency {id} {version} for {targetFramework}
  Source: {source path}
  Target: {target path} (when doing kpm pack)
  File: {lib\aspnet50\x.dll} (when appropriate)

[ChengTian]

This issue depends on @pranavkm 's change at #699

I'll work on it after that change is checked in.