Support erlang term-to-binary encoding of messages [JIRA: CLIENTS-802]

[lukebakken]

This will be for timeseries messages at this point.

[Basho-JIRA]

#445

_[posted via JIRA by Luke Bakken]_

[Basho-JIRA]

PR:
#448

_[posted via JIRA by Derek Somogyi]_