Reference github issues now.

Hosted Jira (logstash.jira.com) is currently busted because we have
exceeded the maximum number of users that platform can accomodate
(according to Atlassian support). Until that is resolved, let's point
everyone at github issues instead.

closes elastic#1508

CONTRIBUTING.md

@@ -26,22 +26,22 @@ irc.freenode.org and ask for help there!
 
 ## Have an Idea or Feature Request?
 
-* File a ticket on [jira](https://logstash.jira.com/secure/Dashboard.jspa), or email the
+* File a ticket on [github](https://github.com/elasticsearch/logstash/issues), or email the
   [mailing list](http://groups.google.com/group/logstash-users), or email
   me personally ([email protected]) if that is more comfortable.
 
 ## Something Not Working? Found a Bug?
 
 If you think you found a bug, it probably is a bug.
 
-* File it on [jira](https://logstash.jira.com/secure/Dashboard.jspa)
+* File it on [github](https://github.com/elasticsearch/logstash/issues)
 * or the [mailing list](http://groups.google.com/group/logstash-users).
 
 # Contributing Documentation and Code Changes
 
 If you have a bugfix or new feature that you would like to contribute to
 logstash, and you think it will take more than a few minutes to produce the fix
-(ie; write code), it is worth discussing the change with the logstash users and developers first! You can reach us via [jira](https://logstash.jira.com/secure/Dashboard.jspa), the [mailing list](http://groups.google.com/group/logstash-users), or via IRC (#logstash on freenode irc)
+(ie; write code), it is worth discussing the change with the logstash users and developers first! You can reach us via [github](https://github.com/elasticsearch/logstash/issues), the [mailing list](http://groups.google.com/group/logstash-users), or via IRC (#logstash on freenode irc)
 
 ## Contribution Steps
 
@@ -55,7 +55,7 @@ logstash, and you think it will take more than a few minutes to produce the fix
 3. Send a pull request! Push your changes to your fork of the repository and
    [submit a pull
    request](https://help.github.com/articles/using-pull-requests). In the pull
-   request, describe what your changes do and mention any jira issues related
+   request, describe what your changes do and mention any bugs/issues related
    to the pull request.
 
 

docs/learn.md

@@ -33,7 +33,7 @@ email the mailing list ([email protected]). Further, there is also
 an IRC channel - #logstash on irc.freenode.org.
 
 If you find a bug or have a feature request, file them
-on <http://logstash.jira.com/>. (Honestly though, if you prefer email or irc
+on [github](https://github.com/elasticsearch/logstas/issues). (Honestly though, if you prefer email or irc
 for such things, that works for me, too.)
 
 ## Download It