Heroku build failed during CoffeeScript compile.

Error from heroku:

```
/tmp/build_ea0cbbef-9289-49f0-9b7a-dec1e6374440/node_modules/lineman/node_modules/grunt/node_modules/coffee-script/lib/coffee-script/coffee-script.js:51
      throw err;
            ^
SyntaxError: In /tmp/build_ea0cbbef-9289-49f0-9b7a-dec1e6374440/config/application.coffee, multiple object literal properties named "paths"
    at SyntaxError (<anonymous>)
    at Obj.exports.Obj.Obj.compileNode (/tmp/build_ea0cbbef-9289-49f0-9b7a-dec1e6374440/node_modules/lineman/node_modules/grunt/node_modules/coffee-script/lib/coffee-script/nodes.js:1187:19)
    at Obj.exports.Base.Base.compile (/tmp/build_ea0cbbef-9289-49f0-9b7a-dec1e6374440/node_modules/lineman/node_modules/grunt/node_modules/coffee-script/lib/coffee-script/nodes.js:46:21)
```

It appears that the CoffeeScript compiling application.coffee is quite
old (1.3.3). Still, unsure why this error wasn't happening locally but
also not eager to dig into it at the moment.