Log Message:
Update to 1.26

Upstream changes:
Release 1.26 - 24 July 2017
 - Untaint $DEVEL_COVER_OPTIONS (Alexey Sokolov) (github 187).
 - Add loose_perms option (Todd Rinaldo) (github 185).
 - Set EXTENDED_TESTING during cpancover runs.
 - Improve version parsing for cpancover (Helmut Wollmersdorfer) (github 124).
 - Improve cpancover code and documentation