update CI configuration:

* drop MRI 1.9.2
* add MRI 2.1.0
* bump jruby and rbx support
* specifically test both rails 3.2 and 4.0
* rotate and secure flowdock token
updates badges and copyright year
update `thincloud-test-rails` dependency:

* better support testing both Rails 3.2 and 4.0
add explicit dependency for `bcrypt-ruby`
better support for rails 4.x