Fix #39: Look for exact repository name before using wildcards.
Fix #39: Look for exact repository name before using wildcards.

This modifies SourceRepo::load_by_name() to look for a repositoyr with the
exact name given first, and then fallback onto the old method of looking for
a repo that simply contains the given name.  This both addresses the problem
and maintains compatibility with the existing behavior and/or expectations.

mantisbt-plugins/source-integration,bright-tools/source-integration,dregad/source-integration,make-all/source-integration,bright-tools/source-integration,make-all/source-integration,make-all/source-integration,bright-tools/source-integration-fixes,01-Scripts/source-integration,bright-tools/source-integration,morgant/source-integration,bright-tools/source-integration,dregad/source-integration,bright-tools/source-integration-fixes,01-Scripts/source-integration,mantisbt-plugins/source-integration,morgant/source-integration,morgant/source-integration,bright-tools/source-integration-fixes,dregad/source-integration,mantisbt-plugins/source-integration