Added Private-Package, and removed Export-Package

Since Export-package was removed in this upgraded version, not able to consume the same in OSGi environment. The bundle json-schema-core is trying to import, but could not resolve the dependency, because
Private-Package: com.github.fge.jackson,com.github.fge.jackson.jsonpointer

Removed osgi build, verified in my environment. How to by default osgi support. Please support.

Thanks