Prepare for 5.0.9-prerelease
Add @buggj's plugin site to the Community tiddler
Add docs for tw-close-other-tiddlers message

Fixes #461
Improve the descriptive text for missing tiddlers

Now we explain that it’s a missing tiddler, and add a “create” button
Docs update
Add docs for keyboard widget
Force the highlight language to lower case
Allow middle mouse button to trigger navigation suppression when clicking a tiddler link

Equivalent to holding control/command while clicking.
Update grammar docs
Add chinese translation of MissingTiddler stuff in Misc.multids.
Remove the "create" button from the missing tiddler template
Improved tiddler filter documentation
Merge pull request #465 from BramChen/master

Add chinese translation of MissingTiddler stuff in Misc.multids.
Fix problem with "null" message when unloading under IE11

Fixes #457
Signed CLA
Fixed a typo
Merge pull request #467 from nameanyone/master

Fix a typo
Docs on using stylesheets
Fix location of stylesheet docs
Display --help message if run without arguments

Fixes #389