Disabling http, gob and json for RPC.

We only use bson, might as well reflect that.
Update Tools.markdown
Adding a flag to be able to specify vtaction full path.
Merge branch 'master' into replication
Merge commit '281579255b573e525dddd77db463501dae7b6365'
Merge branch 'replication'
Merge branch 'vtocc'