Bug#506362: please move documentation to a separate package

[Adam Heath]

package: libfreemarker-java
version: 2.3.13+debian1-1
severity: minor

The documentation included in this package is only of interest to
developers; if another package has a depends on it, it is not interested
in having all this extra baggage installed.  It just increases the disk
space usage.

Please split the documentation into a separate package.