Merge branch '842_resize_buffers_bug' into 335_xterm_to_ts

setOption('scrollback', 0) no longer returns false, it just warns.

src/BufferSet.test.ts

@@ -5,19 +5,17 @@ import { assert } from 'chai';
 import { ITerminal } from './Interfaces';
 import { BufferSet } from './BufferSet';
 import { Buffer } from './Buffer';
+import { MockTerminal } from './utils/TestUtils';
 
 describe('BufferSet', () => {
   let terminal: ITerminal;
   let bufferSet: BufferSet;
 
   beforeEach(() => {
-    terminal = <any>{
-      cols: 80,
-      rows: 24,
-      options: {
-        scrollback: 1000
-      }
-    };
+    terminal = new MockTerminal();
+    terminal.cols = 80;
+    terminal.rows = 24;
+    terminal.options.scrollback = 1000;
     bufferSet = new BufferSet(terminal);
   });