Streamlined output artifact file names.

Major and minor os version are now seprated by a dot in all
templates.
Puppet bootstrapping now works for all Ubuntu releases.

Previously precise was hardcoded in puppet bootstrap script. Now
lsb-release information is honored to install the correct PuppetLabs
repository.
Fixed hardcoded repo url for enterprise linux.

Previously the repository was hardcoded not honoring the os major
version of the enterprise linux installed. Now the os major verison is
determined by using rpm database and therefore the correct repository is
chosen now.
Template support for Ubuntu 14.04 Server x86_64

Finally also Ubuntu 14.04 Server x86_64 is supported.

Additionally getting the authorized_keys file is now done with wget and
the naming for Ubuntu release has been streamlined to:

ubuntu-<maj>.<min>-<flavor>-<platform>[-puppet][-<builder>]
Fixed wrong package manager command vor rhel. ;-)