Version 1.0.2 - Reimplements "Sticky block" features

Changelog:
* Administrators can now choose, if the block is hidable by teachers or not
* Fixed capabilities
* Better integration of Moodle API

	modified:   block_coursefeedback.php
	modified:   db/access.php
	modified:   lang/de/block_coursefeedback.php
	modified:   lang/en/block_coursefeedback.php
	modified:   lang/fr/block_coursefeedback.php
	modified:   settings.php
	modified:   version.php