Bump shared_mustache for consistent templates.js

The new version of shared_mustache enforces consistent ordering of the
compiled template files. This was previously causing issues where
different machines would compile them in a different order.
Merge pull request #639 from alphagov/bump-shared-mustache

Bump shared_mustache for consistent templates.js
Reduce padding on homepage campaign link

When there is a big campaign at the top of the homepage, the padding
chops off the final character of the 'more info' link.
Merge pull request #640 from alphagov/bugfix-homepage-campaign-alignment

Reduce padding on homepage campaign link