Update README (chmod pk / certificate)
Initial implementation of Azure snapshot/restore repository

TODO:
- refactoring settings
- Azure blob API supports up to 64mb. For more than 64mb, we need to use another API.
See http://msdn.microsoft.com/en-us/library/windowsazure/dd179355.aspx
We first try to load repository settings from cloud.azure settings
Add test for multiple repositories