Replace `ADD` with `COPY`
Update to newer versions
Adding 5.5 version of server
Merge pull request #19 from d3vil-st/master

Adding 5.5 version of server
Fix update.sh to work on 5.5 and lower too
Merge pull request #22 from infosiftr/fix-update

Fix update.sh to work on 5.5 and lower too
New installation check improvement

Checks if the database "mysql" has been installed (i.e. the directory
"mysql" exists in the mysql data directory) instead of checking if
the directory is empty.

For example, the directory may not be empty if a dedicated filesystem
is used for the mysql data and thus a "lost+found" is present in the
directory:

    dd if=/dev/zero of=/tmp/mysql-data.img bs=1024 count=1048576
    mkfs.ext4 /tmp/mysql-data.img
    mount /tmp/mysql-data.img /mnt
    docker run -v /mnt:/var/lib/mysql -t mysql

Signed-off-by: Vincent Giersch <vincent.giersch@ovh.net>
Merge pull request #25 from gierschv/fix/install

New installation check improvement
Add readme stub
Fix minor "git log" usage issue
Update to 5.5.41 and 5.6.22
Add MYSQL_ALLOW_EMPTY_PASSWORD to give user ability to start container with root user having blank password