vecmath: add a documentation target to the build, use package annotation for javadoc

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
vecmath: replace the old ant build script, everything should be in the new one now

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
vecmath: make the default target build everything

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>