Replaced erlang:now with erlang:timestamp#87

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TBK145 wants to merge 3 commits intobasho:developfrom

TBK145:develop

Commits on Oct 1, 2015

Replaced erlang:now with erlang:timestamp, as erlang:now is deprecated in Erlang 18.
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Commits on Oct 2, 2015

Bumped lager dependency.
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Commits on Oct 7, 2015

Erlang 18 and backwards compatible using time_compat library.
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