Expand upon date filtering options to be natural language

[bnvk]

An interesting thread was started after a path @simonv3 submitted about the current date filtering. When passing month arguments does it show one April or multiple Aprils?

• -d april shows most recent (or current) april
• -d april all would a concatenation of all previous aprils

Currently, you can specify a specific April with the arg like -d 2013-04 but perhaps would it be nice to also support more natural language style args like:

• -d last april shows previous year April result
• -d april 2012 shows April in year 2012

Just some ideas... looks like there might be a plugin for Moment.js that does this already moment-natural