use auto return in std.datetime
Merge pull request #2689 from WalterBright/toauto

[blocker fix]: use auto return in std.datetime
issue 13717

https://issues.dlang.org/show_bug.cgi?id=13717
Merge pull request #2692 from 9il/issue13717

fix issue 13717
std.windows.syserror: Fix doc build error
std.internal.cstring: clean imports
scope buffer: clean imports
std.bitmanip: clean imports
Merge pull request #2695 from 9il/sb

scope buffer: clean imports
Merge pull request #2696 from 9il/bm

std.bitmanip: clean imports
Merge pull request #2694 from 9il/cstring

std.internal.cstring: clean imports
Merge pull request #2693 from CyberShadow/pull-20141112-205225

std.windows.syserror: Fix doc build error