Protect against XSS and CSRF + some improvements

[metamorfosec]

Hello.., This is a pull request for issue #29 .

[atutor]

There are some new problems with the content editor and rendered content contain page templates. When a page template is added the reorder buttons and a rouge X gets rendered when the content is displayed. The reorder button should only appear in the Page Template preview in the content editor.

Can any of the HTML Purifier files be eliminated. There seems to be a lot of files that are not required. Also things like the form_demo.php in the crsf folder should be cleaned out.

I have not done a thorough code review. This pull request should be broken down into smaller more manageable chunks. And, a little more description provided with each.

As it is I can't merge this pull request.

[metamorfosec]

Hello.., Thanks for fast response. I have updated the files as your suggestion and the issue above should be fixed now. However, I still have faced some warning messages as in original work also behaves like that. I will provide the updates with more descriptive in smaller more manageable chunks as your suggestion. Regards.