Run rspec within bundle exec

[lacostej]

Pull Request Description

rspec fails if you have conflicting versions of coveralls and simplecov

acostej@MacBook-Pro ~/Code/OSS/u3d (master) rspec

An error occurred while loading spec_helper. - Did you mean?
                    rspec ./spec/spec_helper.rb

Failure/Error: require 'coveralls'

Gem::ConflictError:
  Unable to activate coveralls-0.8.23, because simplecov-0.17.1 conflicts with simplecov (~> 0.16.1)
# ./spec/spec_helper.rb:26:in `<top (required)>'
# ------------------
# --- Caused by: ---
# LoadError:
#   cannot load such file -- coveralls
#   ./spec/spec_helper.rb:26:in `<top (required)>'
No examples found.
No examples found.


Finished in 0.00002 seconds (files took 0.18473 seconds to load)
0 examples, 0 failures, 1 error occurred outside of examples

Finished in 0.00002 seconds (files took 0.18473 seconds to load)
0 examples, 0 failures, 1 error occurred outside of examples