Refactoring repository

- Updated README
- Removes storage client library (which now has its own `azure-storage-net` repository with the v3+ release
- Rebalances and refactors by moving the old `libraries/` folder up as the new root
- Adds information in a Markdown file in the new services/storage folder with information about the tagged 2.1.0.4 release as well as the v3 release in the new repo