Bring `lead` styles more inline with GOV.UK ones

Bootstrap uses a lighter font weight for text using the lead class.
This lighter text is harder to read and looks out of place with all of
GOV.UK’s font rendering.

* Reset back to normal font weight
* Lighten text colour to maintain balance
Include MS version of Gill Sans

* On IE neither GillSans nor Gill Sans were matching
* In Chrome on windows, Chrome has been known to pick “Gill Sans Ultra
Bold” instead
Merge pull request #41 from alphagov/gill-sans-mt

Include Microsoft version of Gill Sans in font stack
Merge pull request #40 from alphagov/reduce-lead

Bring `lead` styles more inline with GOV.UK ones
Version 1.1.3

* Fix GillSans font stack for IE and Chrome on Windows
* Tweak Bootstrap’s default `lead` styles to be stronger
Resolve bundler warning about duplicate dep

"govuk_admin_template at /Users/<user>/govuk/govuk_admin_template did not have a valid gemspec.
This prevents bundler from installing bins or native extensions, but that may not affect its functionality.
The validation message from Rubygems was:
  duplicate dependency on rails (= 3.2.18, development), (>= 3.2.0) use:
    add_runtime_dependency 'rails', '= 3.2.18', '>= 3.2.0'"
Don't specify the patchlevel in .ruby-version

* Let rbenv-alias take the strain
Allow patchlevels for runtime deps

* bootstrap-sass was pinned at an older version with  problems related to fingerprinted asset urls
* be consistent with jquery-rails
Minimum Ruby version of 1.9.3
Use image-url(...) over url(...)

* We can't reference non-digest asset names in Rails 4
Load bootstrap-sprockets before bootstrap

* Fixes the incorrect generation of non-MD5 asset names
* Allows the bootstrap glyphicons to load correctly in Rails 4 apps
Move :publish_gem rake task into lib/tasks

* precursor to adding sass:check, which might otherwise inflate the Rakefile
  unduly if lib/tasks didn't exist
Add a sass:check task as part of the build

* The build will break if there are unguarded url() usages that would result
  in asset 404s for production Rails 4 apps.
Merge pull request #42 from alphagov/fingerprint-urls

Rails 4-compatible digest asset URL references
Bump version to 1.1.4

* Fixes missing assets in production Rails 4 apps, both our own
  (header-crown.png) and Bootstrap's glyphicon font-using bits
Merge pull request #43 from alphagov/bump-to-1.1.4

Bump version to 1.1.4
Move lib/tasks/*.rake to tasks/*.rake

Railties loads rake files from gems' lib/tasks directory these days. As
such, tasks therein should be seen as public, shared, and ready for use
in consuming projects. None of the tasks we have here fit that
description, and attempting to use them (for example, in transition)
causes errors using Rake as the consuming application attempts to load
wholly inappropriate things like gem_publisher. Moving the tasks to a
root ./tasks directory makes this problem go away.
Merge pull request #44 from alphagov/fix-rake-tasks-location

Move lib/tasks/*.rake to tasks/*.rake
Bump version to 1.1.5
Merge pull request #45 from alphagov/bump-version-to-1.1.5

Bump version to 1.1.5