small code-cleanup: remove sprintf in favor of built in elgg_echo params, remove unused variables, properly return mime in download headers
Allows site administrators to transfer ownership of a plugin project to another user.
no need for lightbox anymore (userpicker doesn't work in it)
Adds ability for plugin owners to show a list of contributors
Merge pull request #13 from beck24/transfer-ownership

Transfer ownership to another user
Merge branch 'contributors' of https://github.com/beck24/community_plugins into contributors-merge

Conflicts:
	start.php
	views/default/plugins/project_sidebar/admin.php

Resolved conflicts
Merge pull request #14 from beck24/contributors

Adds ability for plugin owners to show a list of contributors
Merge pull request #12 from beck24/code-cleanup

small code-cleanup: remove sprintf in favor of built in elgg_echo params...