Mark up test README and add PHPUnit installation instructions
WIP: Add KCFinder to enable file uploads in info pages

Work in progress: switching between Local Exchange's session handler and
PHP's built in handler is needed.
CKEditor 4.4.1 as submodule

Enable by default, since it should always be available.
For some reason a custom configuration file no longer works when using
the development code, so the configuration has been moved into PHP code.
Also, make KCFinder path absolute
KCFinder (with Local Exchange config) 3.11 as submodule

This will be a fork of KCFinder with Local Exchange's session handler.
Use modified configuration for KCFinder
Update README with editor submodule instructions