Actually Remove Rails 4.2 specific ransack requirements!!

Somehow the main change to README.md got lost between #66 and #70. Sorry!
change dependency of bundler/gem_tasks in Rakefile
Merge pull request #100 from rusikf/master

change dependency of bundler/gem_tasks in Rakefile
Merge pull request #92 from mbrookes/patch-1

Actually (!) remove Rails 4.2 specific ransack requirements.
model refers to UpminModel, not the ActiveRecord model
Merge pull request #108 from jimmynguyc/master

Database column with name "title" returns wrong data
Merge remote-tracking branch 'upstream/master'

Synking fork with original.