Shrink volume as much as possible and then extend it 100MB. We used to
do a querymax to see how much we could shrink the volume and then
compute the desired shrinking size, but this leaded to problems. We had
to parse the output of "shrink querymax" which is in a localized natural
language format.

This fixes #53

Fix the root device check to support /dev/xvda[1-9] devices

This fixes #52

Add a noqa comment to suppress:
F401 '__version__' imported but unused

Check if USERS metadata exists in _remove_users_account before trying
to access it.

If the directory name is empty, it should be treated as ".", the
current directory

Check if the candidate directories that are used to host temporary data
are writable by the media.

Thanks to vkoukis@gmail.com for the bug report

Also fix some unicode issues

Remove the buggy conversion of metadata to strings

Encode it to UTF-8 before feeding it to kamaki, otherwise kamaki may
fail.

* Use absolute path when opening README.md
* Fix a pep8 issue

Prior to this patch, the use_persistent_block_device_names sysprep would
trigger a exception if applied on CoreOS Linux because of the lack of
/etc/fstab.

Keep track of the cloud accounts an image was uploaded and registered
on. When changing the current cloud account, the registration info
should also change to represent the current cloud's status. We may have
registered an image on an account and then switch to a different
account. The image should not be shown as registered, unless we switch
back to the old one.

If extlinux is installed on the root partition (the OS does not have a
separate /boot partition) it needs to be reinstalled, otherwise the OS
won't boot.

Detect if a partition has a bootloader installed on its Volume Boot
Record.

Detect the bootloader that is installed on the MBR and assign it to
the BOOTSTRAP image property.

There were cases where the parameter was of type long and this raises
exceptions in newer versions of the python-dialog.

We were not using it.

The method was hot-patched into the pythondialog library if it was
missing. Use the same format found in pythondialog 3.x

New versions of python-dialog will create deprecation warnings when
using the old values

Use dialog constants to compare with the return value of yesno(). In
newer versions of the dialog library, the return value of the function
is unicode strings.

 * Add text/plain as content type in the md5sum file
 * Add application/json as content type in the meta file

Allow the user to upload the image to a different container than the
"images" one.

As the documentation of libguestfs states, a separated thread should
be started after mount_local has finished and before mount_local_run,
which is a blocking command, gets started. Till now, we used to start
the thread just before mount_local.

Also change the mount() method to be able to use it standalone without
a with statement.

Export the image metadata as environment variables before running
scripts on the mounted image. This way the metadata will be visible
and can be used by the scripts if needed.

Allow the user to change the destination container when uploading
images.

This option can be used to prefix each output line with a timestamp.

If the user specifies /dev/null as output file, omit dumping the image.
This can be used for debug reasons.

Update the image properties accordingly if this is the case

Bump version to 0.9next