_ and - both considered non word characters. Fixes #82

Maybe @defunkt wanted the reverse though (consider _ and - word characters)? Either way, it's a config option you can change now.

src/app/editor.coffee

@@ -19,7 +19,7 @@ class Editor extends View
     autosave: false
     autoIndent: true
     autoIndentOnPaste: false
-    nonWordCharacters: "./\()\"’-:,.;<>~!@#$%^&*|+=[]{}`~?"
+    nonWordCharacters: "./\()\"’-_:,.;<>~!@#$%^&*|+=[]{}`~?"
 
   @content: (params) ->
     @div class: @classes(params), tabindex: -1, =>