Depend on other tools and Rake only

That is all this repo needs. Rake is for publishing new versions of the gem.
Clean up README

- Link to all other tools (gems and code)
- Remove testing setup details - that's not relevant here
- Add contributing section
- Add description of vCloud Tools as a meta-gem
We only require Core, Fog and Version

The gemspec will take care of installing all the gems if a user does `gem install vcloud-tools`.  However, if they want to build a script then it is better for them to explicitly require the particular tools they want to use as and when they want to use them as this will make it clearer what is going on, and will allow them to build something that only uses the tools they require.

My thoughts on this inspired by what rspec does, and this specific discussion: https://github.com/rspec/rspec/commit/f10bedd498dff2961d4be9cce793fa152c4a0bbe
Remove fog file example

- This example is covered in the README already
- We are moving away from this approach
Remove details of how to develop against Core

This is not needed here - no development will take place in this repo.
Update gitignore

This should be all that's required (and I'd like to see `vcloud_env.sh` go too, but that is what the team is using at the moment for the integration tests). File extensions for your text editor/tools should be in your global_gitignore.
Update LICENSE
Update all gem versions

All gems have been bumped for the progress bar fix, so updating it here. We won't need to release vCloud Tools every time a gem gets updated, but we might as well make the first release have the most up-to-date gems!
Merge pull request #184 from alphagov/make-tools-meta-gem

[#67235848] Make tools meta gem