allow for line breaks before blocks (#575)

```
if
()
  a=b
```

Author: bounceme

indent/javascript.vim

@@ -73,9 +73,9 @@ function s:Onescope(lnum,text,add)
   return a:text =~ '\%(\<else\|\<do\|=>' . (a:add ? '\|try\|finally' : '' ) . '\)\C' . s:line_term ||
         \ (cursor(a:lnum, match(a:text, ')' . s:line_term)) > -1 &&
         \ s:lookForParens('(', ')', 'cbW', 100) > 0 &&
-        \ cursor(line('.'),match( ' ' . strpart(getline(line('.')),0,col('.') - 1),
-        \ (a:add ? '\K\k*' :
-        \ '\<\%(else\|for\%(\s+each\)\=\|function\*\=\%(\s\+\K\k*\)\=\|if\|let\|switch\|while\|with\)\C') . s:line_term)) > -1) &&
+        \ search((a:add ? '\K\k*' :
+        \ '\<\%(else\|for\%(\s+each\)\=\|function\*\=\%(\s\+\K\k*\)\=\|if\|let\|switch\|while\|with\)\C') .
+        \ '\_s*\%#','bW')) &&
         \ (a:add || (expand("<cword>") == 'while' ? !s:lookForParens('\<do\>\C', '\<while\>\C','bW',100) : 1))
 endfunction