Add hello world tutorial
Modify hello world tutorial for Nick.
Cleaned up organization and made grammar edits. Fixed links.
Document Mustache templates
Revisions made based on Nick's review.
Use CFEngine_promise_attribute macro
Specify default explicitly
no license needed for 25free
Added images to Distribute files doc and cleaned up Add New Tracker instructions. Modified one title per Nick request.
Merge pull request #177 from tzz/master

Redmine#3251: document GMT hard time classes and sys.cdate/sys.date
classes.markdown: Fix there -> these typo
Merge pull request #172 from estenberg/nolicense-25free-master

no license needed for 25free
Fix usage of include_snippet macro
Fix typo in regex...
Document end_rx as optional
Add documentation for eval()
Merge pull request #175 from tzz/tzz/evaluate3

Add documentation for eval()
Add this.promise_dirname documentation
Merge pull request #178 from deb-cfengine/nick_tutorial

Edited and revised tutorials based on Nick's suggestions
Update information about package version selection.

Related to issue #3314.