Project-based Knowledgebase

[I18N] 
* Updated Japanese localization
* Updated German localization

[DOCS] 
* Updated README to include clear upgrade process from v2.3.0 to v3.0.0

[XXX] 
* "Properly" include dynamic components (in init.rb) using ActionDispatch::Reloader.to_prepare
[BUG] 
* Fixed an issue with uninitialized plugin settings causing crashes

v3.0.0-devel1: tagging 3.0.0-devel1

This is an extension of @duanejevon's work in #119, but also potentially touches on:

* #100 (new scopes may address sub-uri issues)
* #41 (3.x branch is EXCLUSIVELY project-based)
* #97 (basic "watch" functionality has been added)
* #11 (since we're no longer global, the initial release should fully support proper searching)