Update markdown reference to external issues

1. Issue may be not only in jira.
2. Rewrite method for support different external issue trackers
change bash to sh
fix bash-ism
Update user_management.md

add rails_env to commands
Update markdown.rb

Fix mistake by @qqshfox report
move env to end of lines
fix link_to by @bwrsandman

Add missing '#'
Document the extra.sign_in_text setting for CE
Update highlight.js to 8.2, fixes #519
add current sign-in date

add current sign-in date to admin section profile view
Make tree readme title - a link with anchor to README section

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
add missing config files to check during release process
Adding in snippet search functionality

http://feedback.gitlab.com/forums/176466-general/suggestions/5529795-search-though-snippets
Fine-tune the Remove Project redirect. Now it redirects to admin_projects_path and shows a flash message confirming the action has been taken.
Changing some formatting for the Hound, modifying some UI text
Updated simplecov to 0.9.0
Mention that people should use the CentOS tools.
Refactor Oauth::User class to use instance methods
Use instance methods of LDAP::User as well

Still in need of some proper cleanup
Move auth hash to a seperate class