(arm-4) Update arm-4. New template format, new content. Now implemented.

This updates the heredoc arm.4. It is rewritten using the new arm
template format. New features have been introduced and some restrictions
from the previous version of the document has been removed.

There is now also a reference to the full implementation of the
proposal.
Merge branch 'master' of ssh://git@github.com/puppetlabs/armatures.git

Conflicts:
	arm-4.heredoc/metadata.json
(ARM-4) Update ARM 4 Heredoc to 2.0.0

This concludes a series of edits fixing details in the text to make it
use the new template and describe how the reference implementation
works.
Merge pull request #37 from hlindberg/master

ARM-4 Heredoc Update to Version 2 - ready for submission