Merge pull request #228 from specialbrand/develop

New is_404() helper method to determine if a page is 404.
fix for blog module issue 7
Merge branch 'develop' of github.com:daylightstudio/FUEL-CMS into develop
Fixed documentation links for opt-in-controllers documentation
fix issue with missing file helper function
fixes to default sitemap.xml file to use CDATA for loc tag
added space after preview path for file field type
fixed error when the _ci_cached_vars[$scope] is empty in the Loader::get_vars method
fixed links to CI docs
fixed issue with passing urls to the Fuel_redirects::test method
fixed issue where if Fuel_redirects::max_redirects is equal to 0, that it would return an error message
updated FUEL_VERSION number to 1.0.4