Add a footer app to backbone

midas needs a configurable footer, at the very least to show
what version is running.

Add a new footer app into backbone with its own view and template

The template (footer_template) can be modified in your local
config repository and pulled in using the `make import` command
(see changes to Makefile)

Added a new module to sails config called version.  You can
get sails.config.version, which contains elements:
	version (version number from package.json)
	gitShort (short version of current git commit)
	gitLong (long version of current git commit)

This object is also included in layout.ejs so that it can
be used by the frontend immediately, without having to make
any backend queries.