Upgraded SilverStripe to v3.1-beta3
Renamed vendor directory to libs to avoid SilverStripe conflict; Renamed fonts directory; Added dev environment mode to config
Updated location of requirements folder; Changed location of fonts and img directories
Updated gitignore
Enabled scrollspy and transitions for Back to Top button
Updated read me file
Fixed formatting in readme file
Additional updates to README file
Updates to themes for better HTML5 support
Merge branch 'feature/3.1_beta' into develop