Fix crash on x64 Python on Windows
- Fixes for shared access signature for azure storage containers/blobs: wrong constants, quoting of the signature in the url.
- Added tests that verify that an anonymous 'GET' on the blob url that has the shared access signature actually works.
Updated version for next release
Added more tests for SAS
Split normal run and coverage run in separate batch files and added ability to specify python folder
Merge pull request #76 from huguesv/bugfixes

Bugfixes
Merge pull request #77 from WindowsAzure/dev

2013-03-20 Version 0.6.2
* Fixes for bugs: 
   #75  crash on python 2.7 x64 windows
   #73  _convert_query_string return a wrong query string parameter