Remove parenthesis from empty functions

Per CoffeeScript convention, you should do this:

    goodFunction = ->

Not this:

    badFunction= () ->

See these style guides:

https://github.com/polarmobile/coffeescript-style-guide#functions
http://nerdkitchen.org/blog/coffeescript-style-guide/
Merge pull request #14 from EvanHahn/no_parens_arguments

Remove parenthesis from empty functions