We now use a shebang of: #!/usr/bin/env rspec

This enables the direct execution of spec tests again, which was lost earlier
during the transition to more directly using the rspec2 runtime environment.

rspec2 automatically sets a bunch of load-path stuff we were by hand, so we
can just stop. As a side-effect we can now avoid a whole pile of stupid things
to try and include the spec_helper.rb file...

...and then we can stop protecting spec_helper from evaluating twice, since we
now require it with a consistent name.  Yay.

Reviewed-By: Pieter van de Bruggen <pieter@puppetlabs.com>

Doing a require to a relative path can cause files to be required more
than once when they're required from different relative paths.  If you
expand the path fully, this won't happen.  Ruby 1.9 also requires that
you use expand_path when doing these requires.

Paired-with: Jesse Wolfe

It is now possible to specify queries in the form “meta.timestamp.xx”
where xx is eq,ne,gt,lt,ge,le when searching the inventory service.

This REST interface returns a list of nodes that match a fact query.
Fact queries can use (in)equality testing as a string comparison, and >,
<, >=, <= numerical comparisons.  Multiple tests can be done as AND
comparisons, not OR.

The fact queries need to be prefixed by facts, and the comparisons other
than equality are specified with a .comparison_type after the fact name.

This will be better explained in the REST documentation on the website.

Searches that don't match anything now return empty array instead of a
404 error.