Insure that Drush will set an error status code from sql-query if the query fails for any reason.  Fixes #34.
Fix command name typo - usage-view should be usage-show
Merge branch 'master' of https://github.com/drush-ops/drush into usage-show-send-error
Merge branch 'master' of github.com:kostajh/drush into usage-show-send-error
Add a function doc comment, return drush_set_error