Bump rspec, rspec-rails to ~2.14

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Add deprecated_alias macro

Surprisingly, ActiveSupport does not provide this functionality out
of the box: the Rails `deprecate` macro does not alias.

Signed-off-by: Alex Coles <alex@alexbcoles.com>
deprecate_alias Franglais Version#*pourcent methods

See e9dd76e6.

Signed-off-by: Alex Coles <alex@alexbcoles.com>