Be safer when trying to load XML.

... The given file might not have loaded successfully.
Fix the logic in checking the HTTP code, and fix a strict warning.
Basic i18n_string integration.

Allows for translation of the field labels.
Merge pull request #124 from adam-vessey/7.x-i18n_string-integration

Basic i18n_string integration.
Avoid assignments in conditions.
Merge pull request #123 from adam-vessey/7.x-solrconfig-loading

Load and parse the solrconfig.xml, leveraging XPath to do most of the lifting...
Allow drush to work when in the islandora_solr module directory.

When looking back up the filesystem, Drupal bootstrapping hits a false
positive (http://drupal.org/node/1481270#comment-6585758 gave me the
clue)... So yeah, don't create an "includes/common.inc".