ENHANCEMENT Moderator UI using built-in GridField
ENHANCEMENT Moved categories UI

Makes more sense for categories to be defined at the ForumHolder level and applied via drop down to each Forum (as a single field this has been moved to the main tab).
DOCS No longer requires TagField module

I have also adopted this module, since I am interested in anything that help people connect and share knowledge online it fits my philosophy :)
DOCS Update the installation doc

Mention composer as a recommended way to install, also that manual directory can also be used.
DOCS fix typo
Merge pull request #72 from camfindlay/modui

ENHANCEMENT: Moderator UI using built-in GridField
Merge pull request #74 from camfindlay/forumcategories

ENHANCEMENT Moved categories UI