Use -o loop for mounting read-write image

Older systems (e.g RHEL 6) mount command is not able to detect
a loop mount and requires the -o loop option in order to work
Merge pull request #409 from adrianschroeter/master

SLE 12 and openSUSE 13.2 fixes
Compress Docker images using XZ

This results in images requiring less disk space.
Merge pull request #408 from flavio/docker_change_compression_algorithm

Compress Docker images using XZ
- v7.01.8 released
Cleanup with regards to coding style guide
Fixed error logging to default log file
- v7.01.9 released
Redirect stderr from cp command so that we can catch it
Fixed setup of zypper repository name if no alias is specified

If no alias name is given in the kiwi <repository> section, kiwi
builds a name from the given source URI. If the source URI does
contain credentials information appended as token after the RFC
specified '?' sign the repo name contains this information too
which results in an invalid repository name for zypper. In order
to prevent this kiwi cuts off the information '\?.*' from the
URI and build the name from the remaining part
readd lost promo dvd plugin
Make sure correct grub2 module path is used for ec2hvm firmware

Currently the grub2 module path is set correctly with firmware
set to 'ec2' but not if set to 'ec2hvm'
Fixed typo: boottimout -> boottimeout
Merge pull request #411 from coolo/master

Added promo dvd plugin for openSUSE 13.2
Make sure to wait for the storage device if set in root=
- v7.01.10 released
Fixed grub2 xen module list

Some modules available in grub2 are not available for grub2
in xen, e.g chain
- v7.01.11 released
Don't skip grub2 prefix setup for ec2|ec2hvm
- v7.01.12 released