Update guidance on Gemfiles
Merge pull request #35 from alphagov/gemfile-guidance

Update guidance on Gemfiles
Fix header levels.

This is a separate section, not part of the commit messages section.
[git] Add guidance for linking to issue trackers

We've been seeing some commit messages that only include a link to an
issue tracker.  Adding some guidance here should help to address that.
Merge pull request #37 from alphagov/git_issue_tracker_links

Add guidance for linking to issue trackers from commit messages
Guidance around git commit size
Deprecate references to extdata

Since we're moving toward using Hiera, I've updated the docs. Clever, eh?
There might also be the odd grammatical fix in this commit,too.
Sneak in an extra grammar fix or two.

You know, while @ajlanghorn's in there already.
Correct smushed-together lines.

@ajlanghorn says it was all Vim's fault.
Sneak in another grammar fix.

You know, while @fatbusinessman's in there already.
Merge pull request #39 from alphagov/deprecate-extdata-references

Deprecate references to extdata
Merge pull request #38 from alphagov/git-commit-size

Add some guidance around git commit size
Rubocop annotations for Ruby styleguide
Document Rubocop setup