fix(lint): Resolve linter errors

src/flux/coffee-helpers.coffee

@@ -4,10 +4,10 @@ module.exports =
   # This copied out CoffeeScript
   includeModule: (mixin) ->
     if not mixin
-      return throw 'Supplied mixin was not found'
+      return throw new Error('Supplied mixin was not found')
 
     if not _
-      return throw 'Underscore was not found'
+      return throw new Error('Underscore was not found')
 
     mixin = mixin.prototype if _.isFunction(mixin)
 

src/flux/models/tag.coffee

@@ -4,7 +4,7 @@ _ = require 'underscore-plus'
 
 ###
 Public: The Tag model represents a Nylas Tag object. For more information
-about Tags on the Nylas Platform, read the 
+about Tags on the Nylas Platform, read the
 [https://nylas.com/docs/api#tags](Tags API Documentation)
 
 ## Attributes

src/flux/models/thread.coffee

@@ -11,7 +11,7 @@ Function::getter = (prop, get) ->
 
 ###
 Public: The Thread model represents a Nylas Thread object. For more information
-about Threads on the Nylas Platform, read the 
+about Threads on the Nylas Platform, read the
 [https://nylas.com/docs/api#threads](Threads API Documentation)
 
 ## Attributes