* Minor security improvements:
	* Escape goal value before outputting them, both on frontend and in the admin.
	* Block direct file access to plugin files.
	* Sanitize user settings before saving.
	* Properly load CSS over HTTPS when admin is using HTTPS.

* Other improvements:
	* Remove unused functions in admin class.
	* Made clicky script output smaller by removing extraneous newlines.
	* Slight cosmetic changes to admin.
	* Moved screenshots to assets directory.

* Inline documentation:
	* Change link to goals setup to link straight to current site's goal setup page.
	* Change links to point to clicky.com instead of getclicky.com.
	* Change all links to yoast.com to point to https instead of http.