In the Debian instructions use wget which is by default installed in
the Base system.

 * Add instructions for CentOS 7
 * Use curl in favor of wget on Fedora and CentOS systems.

If a command needs root privileges use # as prompt. In any other case
use $.

Update supported Ubuntu and Fedora versions

Add instruction for importing the repository's GPG key before
installing the Debian packages

Add installation instructions for OpenSUSE

 * Add instruction on how to install the debian packages
 * Update version to 0.4.1
 * Add a small comment about the diskdump format

Update the documentation to reflect the changes made after 0.2.4

Add installation sections for Fedora and CentOS

 * Add contact info
 * Add info on how to install Arch Linux packages
 * Add limitations section in usage

Credits go to Alex Pyrgiotis <apyrgio@grnet.gr>

Add missing rsync dependency dependency in the install section of
the documentation

 * Add instuctions for installing the software in Ubuntu 12.10
 * Rephrase some parts in install, overview and usage sections

Make them comply with current source tree

In the "Installation from source" scenario, add python-sendfile to the
list of dependecies that will be installed via apt-get. Else, it would
complain about missing C headers and the user would need to download
python-dev instead.

The older method of installing snf-image-creator from source is restored
and presented alongside the official package installation method.

Drop python installation method in favor of a simpler method using
packages from the apt.dev.grnet.gr repo.

As stated in commit b5053149, these
packages are not needed for the installation of snf-image-creator.

Remove python-gevent and python-dev from the dependencies list for
snf-image-creator. These two packages were needed for kamaki < 0.1
version, but now are obsolete.

Add missing sections