update rails for dup for work

dup doesn't work for rails 3.2.11 + ruby 2.0, have to upgrade rails to 3.2.14
Merge branch 'development' of github.com:Coursemology/coursemology.org into dev/raymoond_dev

Conflicts:
	Gemfile.lock
access control, students can't duplicate course
course full duplicate
duplicate survey
paperclip preserver old file
duplicate forum
enable callback when dup file
copy s3 file when dup file
dup file without skip callback
soft link file when copy
before updating to bootstrap 3
half cooked duplicate UI
duplicate selected records
assignment -> item
fix empty root dup bug
float duplicate button position fix
loading page when busy
handle timeout when duplicate course
course duplication options