Millisecond precision lost [JIRA: CLIENTS-749]

[lukebakken]

From a Riak TS user:

put : ['site1', 'species1', datetime.datetime(2016, 2, 1, 21, 6, 45, 45289), 22.5]
query : [['site1', 'species1', datetime.datetime(2016, 2, 1, 21, 6, 45), 22.5]]

[lukebakken]

Depends on #429

[lukebakken]

This bug is affecting the fix for Python 3.3 and 3.4: https://bugs.python.org/issue23517