Merge branch 'hotfix/1.26.6'
make utf-8 prompt support ruby 2.2
merge #3235 make utf-8 prompt support ruby 2.2
check latest also for ruby-2.2+, fix #3234
fix installing bundled gems in ruby-2.2.0, update ruby/ruby#798
1.26.7
Merge branch 'master' into hotfix/1.26.7
Merge branch 'hotfix/1.26.7' into stable