Enabled preloading of phone metadata.

Helps first-time loading by a number of seconds.

(cherry picked from commit 9269e9dbbff66df6f2ffe824653af578a08062f4)

Conflicts:
	csharp/GlobalAssemblyInfo.cs
	csharp/PhoneNumbers.nuspec
Merge pull request #2 from elijajah/feature/addMetadataPreloading

Enabled preloading of phone metadata.