Version bump (3.1.0)
Drop euca-create-volume's --zone option

Commit 84efe11 added the --availability-zone option but didn't remove
--zone to avoid breaking scripts.  This commit removes the erroneous
option.

Fixes TOOLS-348
Added feature to allow bucket management for images; either single bucket for all images or separate bucket for each image (kernel, ramdisk, root image)
Cleaned up the argument handling for enabling separate bucket storage for images.
Minor cleanup
Merge branch '3.0-maint'
Merge branch '3.0-maint'
Implement DescribeInstanceStatus
support --kernel and --ramdisk parameters to euca-bundle-upload (required for bundle-instance for Linux instances)
Merge branch '3.0-maint'

Conflicts:
	euca2ools/__init__.py
fix per suggestion by gholmes
Merge remote-tracking branch 'sangmin/master'
TOOLS-390
euca-describe-images does not show "name" value
Merge branch '3.0-maint'

Conflicts:
	euca2ools/__init__.py
Merge remote-tracking branch 'mmunn1/3.0-maint'
Re-add account IDs and add name fallback to DescribeImages

Fixes TOOLS-390
Specific instructions for Ubuntu 12.04
Merge pull request #33 from dmitrii/master

Specific instructions for Ubuntu 12.04
Update INSTALL

Making it clearer that the Ubuntu-specific information is about dependencies.
Rearrange distro-specific instructions a bit