Upgrade rspec-expectations from 3.1.0 to 3.1.1
Upgrade rspec-mocks from 3.1.0 to 3.1.1
Upgrade shoulda-matchers from 2.6.2 to 2.7.0

`ensure_inclusion_of` and `ensure_exclusion_of` were renamed and will be
removed in 3.0.0.
Upgrade rubocop from 0.25.0 to 0.26.1

Also upgrades:
- ruby-progressbar

Also installs:
- astrolabe
Upgrade sass from 3.4.3 to 3.4.5
Upgrade tins from 1.3.2 to 1.3.3