Remove Bazel build (#94)

* Remove bazel build

Also updated the build badge to reflect internal build status.

third_party/objectify/BUILD

@@ -1,8 +0,0 @@
-package(default_visibility = ["//visibility:public"])
-
-licenses(["notice"])  # MIT/X11
-
-java_library(
-    name = "objectify-v4_1",
-    exports = ["//third_party/objectify/v4_1"],
-)

third_party/objectify/v4_1/BUILD

@@ -1,18 +0,0 @@
-package_group(
-    name = "specific_version",
-    packages = ["//third_party/objectify"],
-)
-
-package(default_visibility = ["//visibility:public"])
-
-licenses(["notice"])  # MIT/X11
-
-java_import(
-    name = "v4_1",
-    jars = ["objectify-4.1.3.jar"],
-    srcjar = "objectify-4.1.3-src.jar",
-    deps = [
-        "@com_google_appengine_api_1_0_sdk",
-        "@javax_servlet_api",
-    ],
-)