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Refactor azure module structure
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Merge pull request #1066 from andrerod/structure

Factoring preview management APIs as separate modules
Notification Hubs: updated references
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Merge pull request #1073 from WindowsAzure/release-0.7.18

Release 0.7.18
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Merge pull request #1070 from andrerod/structure

Update wrappers
Reusing dependencies
1069: Fix incorrect reference
Fix node-uuid version
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