switched checking back to defined? Rails, ActiveModel didn't work in Rails 4.1.4

PhoneValidator didn't load in Rails 4.1.4
load phone_validator if ActiveModel or Rails is defined
raised version number
fixed condition checking ActiveModel or Rails presence
updated Gemfile.lock by building the gem
Merge pull request #32 from jkaipr/master

Checking both ActiveModel and Rails presence in phonelib.rb