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 markdown.rb

Fix mistake by @qqshfox report
fix link_to by @bwrsandman

Add missing '#'
add current sign-in date

add current sign-in date to admin section profile view
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
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
Add new Gitlab::Oauth::AuthHash class
Added search wiki feature
Updating to persist a params snippets variable
Cleaning for the hound
Incorporating Dmitriy's referrer-based routing suggestion
Fixed houndci complaining over too long lines