Fix tests on Travis CI

The tests were failing due to the '~/bin' directory already existing on
the machine. This patch changes the tests to use the directory name
'foo'.

test/tests/link-glob-ambiguous.bash

@@ -2,44 +2,44 @@ test_description='link glob ambiguous'
 . '../test-lib.bash'
 
 test_expect_success 'setup' '
-mkdir ${DOTFILES}/bin
+mkdir ${DOTFILES}/foo
 '
 
 test_expect_failure 'run 1' '
 run_dotbot <<EOF
 - link:
-    ~/bin/:
-        path: bin
+    ~/foo/:
+        path: foo
         glob: true
 EOF
 '
 
 test_expect_failure 'test 1' '
-test -d ~/bin
+test -d ~/foo
 '
 
 test_expect_failure 'run 2' '
 run_dotbot <<EOF
 - link:
-    ~/bin/:
-        path: bin/
+    ~/foo/:
+        path: foo/
         glob: true
 EOF
 '
 
 test_expect_failure 'test 2' '
-test -d ~/bin
+test -d ~/foo
 '
 
 test_expect_success 'run 3' '
 run_dotbot <<EOF
 - link:
-    ~/bin:
-        path: bin
+    ~/foo:
+        path: foo
         glob: true
 EOF
 '
 
 test_expect_success 'test 3' '
-test -d ~/bin
+test -d ~/foo
 '