GEOMESA-349, 324 Create TAR-ball for distributing GeoMesa & GeoMesa tools' script should be filtered resource

Added a new module, geomesa-assemble, to take care of assembling GeoMesa into a tarball.
Also added symlinks in an Ant job for each library to handle different versions for the future.
i think you can define the type of the project as 'pom', then it won't create a jar. see: http://maven.apache.org/pom.html#Maven_Coordinates