Fixed a bug for parsing posix timezone: + on the west from UTC, - on the east#29

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zerkms wants to merge 1 commit intoboostorg:developfrom

zerkms:posix-timezone-sign

Commits on Oct 6, 2015

Fixed a bug for parsing posix timezone: the + sign must be used for timezones on the west of UTC, and - for timezones on the east of UTC correspondingly.
zerkms
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