rejig Gemfiles for consistency across Middleman repo's
Merge pull request #37 from middleman/gemfile-consistency

Rejig Gemfiles for consistency across Middleman repo's
Cane support
don't add resources that already exist
force asset type to a string for sprockets lookup
specify asset type in debug assets (was returning js files to css request)
prep
chmod -x LICENSE.md

This file doesn't have to have executive permission.
Improve markup in CONTRIBUTING.md
Merge pull request #40 from tricknotes/644

chmod -x LICENSE.md
Merge pull request #41 from tricknotes/improve-markup

Improve markup in CONTRIBUTING.md
Update CONTRIBUTING.md
fix 3.0 gemfile
Merge branch 'master' of github.com:middleman/middleman-sprockets
fix 1.8 on 3.1
fix middleman #946
bump
re-enable images
bower support
Fix including external JS files when debug_assets is set to true