Log Message:
Update to 1.70

Upstream changes:
1.70     2016-12-10

- Altered the conversion specifier %z to accept ç°£HH, ç°£HHMM, \ 
ç°£HH:MM and Z.
  Previously only ç°£HHMM where accepted. PR from Christian Hansen, GitHub #13.

1.69     2016-12-04 (TRIAL RELEASE)

- The word boundary check supposedly added in 1.67 didn't really work
  properly, and still matched too much. For example, the pattern "%d-%m-%y"
  would match "2016-11-30" and turn it into November 16, 2030. This \ 
also had
  problems at the end of strings, so that the same pattern would improperly
  match "30-11-2016" as November 30, 2020. Reported by Erik Huelsmann. \ 
GitHub
  #11.

- Added docs for several formats which had long been supported but not
  documented. These are %P, %c, %x, and %X. Reported by Alexander
  Hartmaier. GH #10.