Implement interval-based preview
Implement interval-based preview

freizl/freizl.github.com-old,freizl/freizl.github.com-old,beni55/hakyll,Minoru/hakyll,d12frosted/hakyll,freizl/freizl.github.com-old,Javran/hakyll,freizl/freizl.github.com-old,freizl/freizl.github.com-old,freizl/freizl.github.com-old,oldmanmike/hakyll,freizl/freizl.github.com-old