allow fspath, image_size, exifr, progress and in_threads to go to next minor version
switch rubocop to 0.26
change namespace of some Style cops to Metrics
allow Metrics/PerceivedComplexity of 8
use single quotes in Gemfile
Merge branch 'update-rubocop' into update-dependency-requirements
change rubocop ruby requirement to >= 1.9.3
Merge branch 'update-rubocop' into update-dependency-requirements
Merge branch 'update-dependency-requirements'