Adding issue history tabs plugin

This plugin splits the issue history into two tabs, 'all' and
'comments'. The comments tab only displays the issues notes and all
displays everything (it defaults to comments).
I think this will make it easier to navigate the issue page, as some
issues' histories can can very large.
Changed default tab on issue history

Now tab only defaults to comments (as opposed to all) when there are
more than 25 entries in the issue history.
Make a record of deleted issues so they can be deleted from Producer too, when the sync task runs. NB: db migration required.
Template the sync of deleted issues, but waiting on Producer to complete.
Hide concept of replying to a kb article.
Merge pull request #75 from blrnw3/kb-changes

Hide concept of replying to a kb article.
Merge pull request #76 from blrnw3/master

Routes patch fix
Merge pull request #69 from dannybutler/issue_history_tabs

Adding issue history tabs plugin
Fixed accidental commenting-out.
Merge pull request #74 from blrnw3/producer-more

Make a record of deleted issues so they can be deleted from Producer too...
Ran through the docs and made sure it actually installed as per the instructions and found these things needed to be fixed :)
Merge branch 'master' of https://github.com/artsalliancemedia/redmine into fix-docs
Fix for creating an article from an issue whose author is Anonymous.
Removed the copying of issue notes to article replies, now that this feature is disabled.
Move CSS to more global location so it shows up on the article#show.
Minor change to the focus behaviour of the field to add related issues to an article (no auto-fill).
Merge pull request #78 from blrnw3/kb-changes

Kb changes
Merge pull request #77 from alexlatchford/fix-docs

Ran through the docs and made sure it actually installed as per the inst...
Changing version number