assemble/handlebars-helpers — pull request #171 by lukefrake (2014-12-22 14:43:07+00:00)
Title: Get the sum to attempt to parse before it gives up

Previously the sum helper would ignore anything that wasn't a number and move on, this is a problem as some helpers pass as a string when used like this - `{{sum (now "%Y") 10}}`

As Lodash is already being used in here, I've taken advantage of the parseInt function, which passes through NaN if it can't turn it to number.