added optional escaping
add optional image:geo_location tag for images
set image:title optional for xml rendering
tag v2.4.12

- added optional html escaping
- added image:geo_location
- added image:title
fixed escaping
updated .travis.yml
Merge branch 'master' of https://github.com/RoumenDamianoff/laravel-sitemap

Conflicts:
	src/views/xml.blade.php