Creates all files in a working directory

Creates a new directory (~/.boot2docker) which will contain all the
files (iso, vmdk). Otherwise your whole filesystem is littered with
files.
update to use simpler defaulting syntax
Merge pull request #161 from SvenDowideit/simpler-defaults

Simpler defaults - and use ./boot2docker for iso and vmdk
fix boot2docker.iso not using config variable
create non existing directory structure for boot2docker.iso and boot2docker.vmdk
Merge pull request #164 from SvenDowideit/pr/101

fix boot2docker.iso not using config variable
rootfs: add iproute2
Saved state and status update, credits to @rimusz, at #169
Merge pull request #167 from proppy/add-iproute2

rootfs: add iproute2
don't run ntpclient by default, force the user to configure it by setting NTP_SERVER
Merge pull request #163 from SvenDowideit/dont-run-ntpclient-by-default

run ntpclient by default, let the user to configure it by setting NTP_SERVER, including disable using unset NTP_SERVER