Fixes the following issues
https://github.com/hyperledger/fabric/issues/2146
https://github.com/hyperledger/fabric/issues/2139

 1. Separate java docker image
 2. Added java package info to proto files
 3. Removed duplicate .proto files checked into java shim project, and copy it as part of build process
 4. Modified java unit test to refer to new path
 5. Updated JAVAChaincode documentation to reflect new changes and added instructions for developing new chaincode
 6. Split java chaincode examples from java shim project

Change-Id: I7cbe92449c30700f17949b03f8fc7c06e0c7efb6
Signed-off-by: Satheesh Kathamuthu <satheesh.ceg@gmail.com>