Merge branch 'stable-2.15' into stable-2.16

* stable-2.15:
  Automatically format BUILD file with buildifier lint mode
  Upgrade bazlets to latest stable-2.15 to build with 2.15.9 API
  Upgrade bazlets to latest stable-2.15 to build with 2.15.8 API
  Upgrade bazlets to latest stable-2.14 to build with 2.14.18 API
  Bazel: Include eclipse-out directory in .bazelignore
  Add explanatory comment to empty BUILD file(s)

Change-Id: Iedeed8c2dcc479a1779ed908a8bb5255dddf40d1
diff --git a/.bazelignore b/.bazelignore
new file mode 100644
index 0000000..30f1613
--- /dev/null
+++ b/.bazelignore
@@ -0,0 +1 @@
+eclipse-out
diff --git a/tools/bzl/BUILD b/tools/bzl/BUILD
index e69de29..c5ed0b7 100644
--- a/tools/bzl/BUILD
+++ b/tools/bzl/BUILD
@@ -0,0 +1 @@
+# Empty file required by Bazel
diff --git a/tools/eclipse/BUILD b/tools/eclipse/BUILD
index a06bb85..77a865e 100644
--- a/tools/eclipse/BUILD
+++ b/tools/eclipse/BUILD
@@ -1,8 +1,8 @@
+load("//tools/bzl:classpath.bzl", "classpath_collector")
 load(
     "//tools/bzl:plugin.bzl",
     "GWT_PLUGIN_DEPS",
 )
-load("//tools/bzl:classpath.bzl", "classpath_collector")
 
 classpath_collector(
     name = "main_classpath_collect",