Early return if lss3 is called without any arguments
lss3 supports listing by marker
Fix: Marker should also be applied when prefix is not used
Just use optparse for clean code
Add block_device_mapping to EC2Connection.create_image. Fixes #1766.
Merge pull request #1783 from mrkschan/lss3-marker-support

Lss3 marker support. Fixes #1783.
Merge pull request #1794 from danielgtaylor/create-image

Add block_device_mapping to EC2Connection.create_image. Fixes #1766, #1794.