Adding Options::get_group() which fetches a set of options with a specific prefix.  Useful for plugin options.php
Adding Options::get_group() which fetches a set of options with a specific prefix.  Useful for plugin options.php

Added Options::delete() to delete options.

git-svn-id: d0e296eae3c99886147898d36662a67893ae90b2@1630 653ae4dd-d31e-0410-96ef-6bf7bf53c507

dragonmantank/Habari,dragonmantank/Habari,dragonmantank/Habari