Do not include oli.* symbols in the inheritance chain
Do not document object literals as interfaces

Instead, object literals with properties that should not be
renamed can go in externs/olx.js.
Clean up api.js
Move object literals defined in ol3 to a separate section
Move oli.* stability notes to the corresponding ol.* symbol
Remove all docstrings from oli.js

Instead, make sure that the properties are documented in the
implementing class.
Merge pull request #2072 from ahocevar/no-oli-docs

Do not include oli.* symbols in the API documentation