Added the most recent versions of all runtime dependencies

Fixing this error message:

$ bundle update
Fetching gem metadata from https://rubygems.org/............
Fetching additional metadata from https://rubygems.org/..
Resolving dependencies...
Could not find gem 'rspec-expectations (~> 0) ruby', which is required
by gem 'mediawiki-selenium (~> 0.1.19) ruby', in any of the sources.

Change-Id: I52d441b8447eaaf99ee5d91a9d09dccb52472e93