Bump version to 20171226
Bump version to 20171226

sstephenson/ruby-build,brigade/node-build,dark-panda/ruby-build,brigade/ruby-build,brigade/ruby-build,OiNutter/node-build,makandra/ruby-build,znz/ruby-build,dark-panda/ruby-build,nirvdrum/ruby-build,rbenv/ruby-build,nodenv/node-build,rbenv/ruby-build,mpalmer/puppet-module-ruby-build,ryanfb/ruby-build,mpalmer/puppet-module-ruby-build