Akihiro Motoki 095580ec46 Update sphinx to 1.5
Most projects now use sphinx 1.5.
sphinx 1.5 provides some new directives which are possibly useful.

sphinx 1.5 is a useful feature which considers warnings as error.
It prevents sphinx warnings into documents.
Also fixes existing sphinx warning.

At the same time, requirements.txt is synced with global-requirements.

Change-Id: I3b4a18a2483fa6966d8d4ac78dcb8ceac0524cf7
2017-03-31 00:20:56 +00:00
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