=doc,osg Effort to get OSGi integration tests running again

Discussion at https://groups.google.com/forum/#!topic/akka-dev/VdZz8d5LJEs

* Update protobuf dependency so mvn clean install runs again
* Bump OSGi version range in AkkaBuild to include current 2.3 for generated manifests
* Update path in dev documentation to correct TexBasic folder

Review by @patriknw

btw I signed the CLA