Enable components as labels and improve regexp

 * automatically create components as labels if "addComponentLabels"
   option is true in the config file

 * component labels are automatically created

 * swap order of regex to fix some regex interaction issues

 * use relative links for Github repo links

 * regex assume ticket attachments are uploaded to a new repository
   (possibly on Github)

 * regex now works for images, changesets and other odd Trac links

 * fix bug due to indentation, the bug manifested by only allowing one
   attachment per issue