Allow comparison of versions of unequal length

Basically, because the tracker caches the template names and the
rescanner was deleting the templates without clearing the cache. Should
use Tracker#reset_template instead

because there's an error when string interpolation has more than one
expression inside.

Conflicts:
	test/apps/rails3/app/controllers/home_controller.rb
	test/tests/test_rails3.rb

Conflicts:
	test/apps/rails2/app/controllers/home_controller.rb
	test/tests/test_rails2.rb

Fix `redirect_to` false negative with only_path

Also commit Rails 3 test file which I forgot, oops

Fixes #120

Relative paths for reports

High confidence warnings on `to_json`

Makes slightly more sense and doesn't seem to refer
to application path

Set ActiveSupport.escape_html_entities_in_json=true in versions >= 2.1.0 for autoescaping on a to_json call.

User could compare with the **baseline** json file ignore base directory.

Track render chain for templates

Allow Brakeman to be run without tty

This tests when you have a partial that is rendered from
more than one controller action, which in the past would cause
rendered partials to be overwritten, possibly hiding warnings