Better support for large number of blobs

Small fix to handle situations where the number of blobs (not the size) is very large.
Instead of obtaining the complete list before copying blobs, it processes them one at a time.

x64 version

New x64 version.

upgrade azure storage nuget

Upgraded AzureStorage library.

Vdirs and blobcopy

Virtual Directories and BlobCopy improvements.
Can handle virtual directories that do NOT exist in target location.

S3 Region fix

Small region fix for S3.

Bug tweak

Small fix for bug introduced in 1.1.2 which sometimes stopped the simple/single blob copy process to work.

Dropbox directories

Added directory support for Dropbox.
Can now copy between S3/Azure to/from Dropbox. S3 and Azure will maintain their virtual directories but in Dropbox the real directories will be created.

Virtual Directory tweaks

Virtual Directories are handled in a more consistent manner (in particular between Azure Storage and S3).
If you have virtual directories (ie blobs with / in the name indicating directories... eg mydir/myfile) then you can perform the following

azurecopy -i http://...../mycontainer/mydir/ -o https://........

This will copy all blobs with the prefix "mydir" and copy them to the destination but will trim the "mydir/" prefix from the destination blob. ie it pretends to copy the inner file and keep the inner file name.

If you want to copy everything in a container/bucket and keep the virtual directory structure you can perform the command

azurecopy -i https://..../mycontainer/ -o https://......

This will copy all the contents of mycontainer to the destination, keeping the exact filenames (including virtual directory delimiter /)

blobcopy fix.

Issue with blob name generation when using blobcopy flag.

Small S3 fix.

Added fix when listing contents of S3 bucket using the URL format https://bucketname.s3.amazonaws.com