Remove support for context.isFunction which would flag a function as originating from the context when true and as a dust compiled function when false.
Remove support for context.isFunction which would flag a function as originating from the context when true and as a dust compiled function when false.

ellipticaljs/dustjs,nchlswtsn/dustjs,ellipticaljs/dustjs,catberry/catberry-dust,tachyon1337/dustjs,jrrbru/dustjs,sethkinast/dustjs,cake-disposal-squad/dustjs,aredridel/dustjs,jimmyhchan/dustjs,tachyon1337/dustjs,rphuber/dustjs,alihalabyah/dustjs,shakyShane/crossbow-lang,erg0dic/dustjs,alihalabyah/dustjs,linkedin/dustjs,modulexcite/dustjs,cake-disposal-squad/dustjs,modulexcite/dustjs