Add lexical-binding cookies to test files in test projects that use Buttercup, as it would otherwise fail on them starting with version 1.34 (reported as issue #100).

Author: doublep

test/project-e/test/project-e.el

@@ -1,3 +1,5 @@
+;;  -*- lexical-binding: t -*-
+
 (require 'project-e)
 (require 'buttercup)
 

test/project-i/test/buttercup.el

@@ -1,3 +1,5 @@
+;;  -*- lexical-binding: t -*-
+
 (require 'project-i)
 (require 'project-i-advanced)
 (require 'buttercup)