[MAT-474] Patch up javadoc.

Some javadocs had missing items which caused compilation
failure on my local machine. This fixes them.
[MAT-474] Include licenses in jar.

This patch creates a local copy of the licenses directory
structure as needed for insertion into the jar distribution.
It then adds this directory into the jar at jar assembly time.
[MAT-474] update the combiner to copy in licenses.

This minor edit updates the combiner to ensure that the license
directory is copied from the linux jar into the combined jar.
[MAT-474] Force licensing to be added to jar.

This forces the licenses to be added into an organised directory
structure. They are then added to the jar. The dependency system
is quite hard going, we may need to do something drastic to
UseJava.cmake in the future (rewrite!).
Merge pull request #133 from OpenGamma/MAT-474

MAT-474 add licenses into jar build