It would be nice if org.pf4j.PluginManager#getExtensions had API documentation.

Some things that might be useful to know (or know that they are unspecified, or implementation defined):

1. When extensions are instantiated (When the plugin is loaded/started? When explicitly requested)? (see #232)
2. In which plugin states is it OK to call this method? (In any? In loaded/started only? What hap

At some point, people will ask what the difference is between Java's module system and this library. The differences between both approaches should be documented to answer these questions.

the example should resemble a case that also demonstrates why you'd want to use depject. if you just wanted to get the sounds that cats and dogs make, there are simpler ways to do it than use this library...
not sure what that would be but am thinking about depject todo mvc?

Rip out the unnecessary code to clean up the API and be up to date with what Unity is capable of.

Currently, all field manipulating buttons, such as numeric slider and text area buttons, use single letters to denote their function. These letters need to be replaced with icons that better explain the function of these buttons.