update vim projections
fix spec typo
use RSpec 3 syntax, be_true -> be true
fix rspec 3 failure
use expect/to over should for rspec syntax
use is_expected_to over implicit should for rspec syntax
use allow/expect over should_receive for rspec syntax
use allow/receive over stub for rspec syntax
prefix RSpec on first describe in spec files
use newer barometer-support: 0.0.4
lock development dependency to rspec 3