upgrade naptime to play 2.5

[zhaojunz]

I want to build a version of play 2.5 of naptime, otherwise, i can't boot service in infra-services.

Reviewers: saeta

CC:

Test Plan: unit test passing, will test it in infra-services

Auditors:

[zhaojunz]

I don't know how to handle this as play 2.5 removes all charset=utf-8 after 2.5. see below for the quote:

Play WS would infer a charset from the content type and append a charset to the Content-Type header of the request if one was not already set. This caused some confusion and bugs, and so in 2.5.x the Content-Type header does not automatically include an inferred charset. If you explicitly set a Content-Type header, the setting is honored as is.