fix for https://github.com/opencart/opencart/issues/499
removed !file_existst , !is_file is enough
Merge pull request #501 from faaliyet/master

fix for https://github.com/opencart/opencart/issues/499
added flag for specific info
Merge pull request #502 from faaliyet/master

added flag for specific info
extension system update
Merge branch 'master' of https://github.com/opencart/opencart
Update upload/admin/language/english/localisation/return_reason.php
a massive update to nearly all files to change the breadcrumb system to start using html5 css3 style breadcrumbs.
Merge pull request #504 from devtsit/patch-10

Update upload/admin/language/english/localisation/return_reason.php
breadcrumb
css breadcrumb update
fix for url install issue

also updated the modification system
modification update
more modifcation work done
modification class unfinished
more modification work done
.gitignore update
modification update
changes to the modification system