MAT-474 add licenses into jar build

This PR, to be read in conjunction with https://github.com/OpenGamma/OG-Izy/pull/12 and https://github.com/OpenGamma/OG-Lapack/pull/15:
* Adds the approved license directory structure into all jars and then from the linux jar into the combined jar.
* Forces the build dependencies such that items created by the `NativeLibraryBuilder` cannot be built without assembling the licenses correctly.
* Adds code to import licenses from OG-Izy and OG-Lapack.
* Fixes some minor javadoc issues that were causing compilation failure locally.

Coverage:
No change.