allow external URLs in art_rexseo_url ..
fix duplicate content problem from "index.php" URLs, make redirects RFC conform (aka absolute) ..
add skip_empty_article plugin..
rename EP: REXSEO_POST_INIT -> REXSEO_INCLUDED
prevent rare fatals where OOArticle or OOCategory object cannot be created - assumed causes (wild guess): DB/Cache out of sync due to rogue merging of rex installations..
version bump -> 1.5.3 nightly b044cd6
serve downloads via tags API..
cache API response (for 1 hour)..
version check via tags API ..
remove firephp debug calls..
version bump -> 1.5.3 nightly 27.12.2012
Merge branch 'refs/heads/nightly'

Conflicts:
	classes/class.github_connect.inc.php
	classes/class.rexseo_meta.inc.php
	classes/class.rexseo_rewrite.inc.php
	classes/class.rexseo_robots.inc.php
	classes/class.rexseo_select.inc.php
	classes/class.rexseo_sitemap.inc.php
	config.inc.php
	controller.inc.php
	files/backend.css
	functions/function.rexseo_helpers.inc.php
	help.inc.php
	install.inc.php
	install/backup/backup/addons/rexseo/config.inc.php
	install/files/.htaccess
	install/files/redaxo/.htaccess
	pages/github_api.inc.php
	pages/help.inc.php
	pages/index.inc.php
	pages/settings.inc.php
	uninstall.inc.php
version bump -> 1.5.3