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More HTML::Pipeline filters

Robert Speicher requested to merge rs-more-pipeline-filters into master

The big part of this MR is a feature that is intended to test the entire Markdown-parsing process from beginning to end. See spec/support/markdown_feature.rb and spec/features/markdown_spec.rb.

One big thing this MR fixes is not being able to type a < or > anywhere. It now gets properly escaped.

This MR also adds three more custom HTML::Pipeline filters:

AutolinkFilter

Similar to the built-in Autolink filter in that it still uses Rinku for standard http and ftp links, but then does some further processing to allow auto-linking of any URI scheme. See internal issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2239

SanitizationFilter

Created a simple custom SanitizationFilter that sub-classes the default one and adds our custom whitelisting.

TableOfContentsFilter

Adds the anchor links to each header. This removes some processing from our Redcarpet renderer.

Closes #800 (closed), #1015 (closed), #1528 (closed), #1549 (closed)

Closes GitHub 8535

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