Add osmosis-osm-binary project

This is a custom version of Scott Crosby's OSM Binary project to avoid
depending on a pre-compiled jar.  This is necessary for publishing to
Maven Central.  See the readme.txt in the project for more details.
Update PBF project to use internal OSM Binary project

The PBF project was depending on a pre-compiled jar included in the build-
support ivy project.  This change switches it over to use the osmosis-
osm-binary project which is an Osmosis customised version of the
original library.
Remove the osmpbf pre-compiled jar

We no longer require the pre-compiled osmpbf.jar because it is
superceded by the osmosis-osm-binary project.
Remove internal Ivy repository

All dependencies are now available on Maven Central, therefore we don't
need to maintain an internal Ivy repository any longer.