concat_sourcemap + browserify and sourcemaps

[searls]

Browserify sourcemaps are all inlined, which concat_sourcemap chokes on. Setting debug to false for now (in the future we'll want it set to process.env.LINEMAN_ENV != "production")

[jasonkarns]

Browserify docs show usage of thlorenz/exorcist as a transform to rip the inlined source mapping into its own file.