Add test that builds all the test projects.

Change-Id: I8686052470b71f9f61f83da360a205a2f04d5271
diff --git a/.gitignore b/.gitignore
index 4c28e93..8968a13 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,12 +7,12 @@
 /build
 gradle/build
 tests/*/build
-samples/*/build
-samples/multiproject/*/build
-samples/tictactoe/*/build
-samples/applibtest/*/build
-samples/flavorlib/*/build
-samples/libsTest/*/build
-samples/repo/*/build
+tests/*/build
+tests/multiproject/*/build
+tests/tictactoe/*/build
+tests/applibtest/*/build
+tests/flavorlib/*/build
+tests/libsTest/*/build
+tests/repo/*/build
 /repo
 /out