Added ability to supply node handle and private node handle to Updater
Added ability to specify the private node handle in TestRunner
Also now specify the selftest callback queue on only the service so that it does not apply to the entire node
Added ability to supply a custom node name (prefix) to Updater
Merge pull request #18 from mitchellwills/hydro-devel

Adding ability to use Diagnostics Updater and self test in nodelets