Java POM changes for OSGI

[broach]

Will now add bundle information to MANIFEST in .jar

Also:
Removed unneeded dependencies.
Changed to use rotobuf-maven-plugin from maven central

Fixes #19

[seancribbs]

I see no problem with this, although I am not the expert on POM. 👍

[broach]

Just as an FYI, It doesn't actually do much ... it changes the MANIFEST.MF in the .jar from:

Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Created-By: Apache Maven
Built-By: roach
Build-Jdk: 1.7.0_10

To:

Manifest-Version: 1.0
Bnd-LastModified: 1356022486792
Build-Jdk: 1.7.0_10
Built-By: roach
Bundle-Description: Protocol buffers used to communicate with Riak
Bundle-License: http://www.apache.org/licenses/LICENSE-2.0.txt
Bundle-ManifestVersion: 2
Bundle-Name: Riak Protocol Buffers
Bundle-SymbolicName: com.basho.riak.protobuf.riak-pb
Bundle-Version: 1.2.1
Created-By: Apache Maven Bundle Plugin
Export-Package: com.basho.riak.protobuf;uses:="com.google.protobuf";vers
ion="1.2.1"
Import-Package: com.google.protobuf
Tool: Bnd-1.50.0