Added Code to RPC handler to handle lookup, ping and shutdown RPC requests
Added Code to Node to make Node a singleton
Updated blackdoor jar
Merge branch 'master' into RPC_Handler

Conflicts:
	src/blackdoor/cqbe/test/RPCTester.java
Merge pull request #16 from blackdoor/RPC_Handler

Added Code to RPC handler to handle lookup, ping and shutdown RPC requests