Added some preliminary docs.
Remove the crazy command line arguments system.

All command line arguments are now passed directly to m4, which makes
things much simpler.

To disable updating git repositories, use "-D DISABLE_GIT" instead of
"-g".
Merge pull request #1 from mossblaser/master

Some simple docs
Add attribution and license.
Add proper plugin support.

All .sh files in plugins are now sourced by update, and all .m4 files in
plugins are included in each m4 run.

Git support has been moved from header.m4 to plugins/git.m4.

This still needs documenting.
Whitespace change.
Merge branch 'conman'