Merge pull request #2 from peterhil/develop

Merge reduction of skeleton usage from develop
Make it easier to make custom themes for Twitter Bootstrap by importing it differently. Also makes it possible to selectively enable component styles.
Merge pull request #3 from peterhil/develop

Make it easier to make custom themes for Twitter Bootstrap by importing ...
Don't customize the default Bootstrap navigation and make sure the containers and rows are used properly.
Make instance into a package to be able to import settings from there.
Merge branch 'config-environments' into develop
Merge branch 'develop' to add config environments
Bump package minor version.
Use semantic-ui instead of Twitter Bootstrap.
Change Twitter Bootstrap to Semantic UI on README.md.
Merge branch 'semantic-ui' of github.com:peterhil/skeleton into semantic-ui