Update to RSpec 3.4
Update to RSpec 3.4

RSpec 3 was [released](https://github.com/rspec/rspec/commit/2d9f9e8f29063a5e310afc077910f90ea067dcb7) June 1, 2014 and 3.4.0 was [released](https://github.com/rspec/rspec/commit/7f0ec7a6e6770a16ec32ceafa581f7c77d4cda8b) 9 days ago. The whole test suite seems to run without modification. This is in the spirit of trying to keep gems up to date so there isn't a lot of work to do later on.

liftoffcli/liftoff,liftoffcli/liftoff,liftoffcli/liftoff