Generate API docs for ol3-components

This is not the right place, it is just to show how to make Maven build the docs. Eventually this should be built in a way so it lives next to http://suite.opengeo.org/opengeo-docs/sdk-api/.

@mweisman, would you be able to use this snippet to build the docs as part of opengeo-docs?
@bmmpxf, this is the missing API documentation of the common ol3 template components.