Add 'scriptencoding utf-8' to all scripts

autoload/airline/builder.vim

@@ -1,6 +1,8 @@
 " MIT License. Copyright (c) 2013-2016 Bailey Ling.
 " vim: et ts=2 sts=2 sw=2
 
+scriptencoding utf-8
+
 let s:prototype = {}
 
 function! s:prototype.split(...)
@@ -58,7 +60,7 @@ function! s:prototype.build()
     if is_empty
       " need to fix highlighting groups, since we
       " have skipped a section, we actually need
-      " the previous previous group and so the 
+      " the previous previous group and so the
       " seperator goes from the previous previous group
       " to the current group
       let pgroup = group