Facilitate '-j' when building kernel

thanks for the input of @tianon and @steeve

Signed-off-by: Tzu-Jung Lee <roylee17@gmail.com>
Merge pull request #45 from roylee17/build-kernel-in-parallel

Facilitate '-j' when building kernel
Add the real xz package. Closes #126
docker issue #3957 is not fixed for me by this, but it helps
Merge pull request #134 from SvenDowideit/dont-use-links

docker issue #3957 is not fixed for me by this, but it helps
detect if ports needed for SSH and DOCKER are free on localhost
add git to TCL
Include link to Boxen/Puppet module in README
Merge pull request #139 from aheissenberger/fix/pull/add-git-to-iso

add git to TCL
Merge pull request #137 from aheissenberger/fix/pull/init-check-free-ports

detect if ports needed for SSH and DOCKER are free on localhost and fail to create the VM
Merge pull request #141 from morgante/patch-1

Include link to Boxen/Puppet module in README
Revert "add git to TCL"

This reverts commit ba49f0e943b4aa55a0f55407a10f7737dde648da.
Reorder dependencies. First is the package, next to it its dependencies.
Add git as dependency. Fixes #132. Refs #139
Do not restore TCL package/deps. Fixes #131
Replace comment with information.
Add liblzma for xz. Refs #126
reduce timeout for nc port tests
Merge pull request #142 from aheissenberger/fix/pull/port-detect-timeout

reduce timeout for nc port tests
Make sure we forward all the arguments to ssh