Consider 2,000 lines to be a large file for hints.

This is a fix for #4922... only part of Document.js was being processed
because it was considered a "large file" at 250 lines. 250 lines seems
a bit too conservative. We'll want to see if there are complaints about
memory usage and I think we'll also want to experiment a bit with how
we manage Tern.

But, it seems to me that a file the size of Document.js should not be
getting truncated hints.

src/extensions/default/JavaScriptCodeHints/ScopeManager.js

@@ -59,7 +59,7 @@ define(function (require, exports, module) {
 
     var MAX_HINTS           = 30,  // how often to reset the tern server
         LARGE_LINE_CHANGE   = 100,
-        LARGE_LINE_COUNT    = 250,
+        LARGE_LINE_COUNT    = 2000,
         OFFSET_ZERO         = {line: 0, ch: 0};
 
     /**