missing initialization of transifex object in "particular resource" example
fix project.resource

Per http://support.transifex.com/customer/portal/articles/1009524-resource-api , the URL for a singular resource API call is /project/<project_slug>/resource/<resource_slug>/ , not /project/<project_slug>/resources/<resource_slug>/
Merge pull request #1 from JasonBarnabe/master

Missing initialization of transifex object in "particular resource" example