Support parent / POM-only artifacts and simplify build file generation (#203)

* Support parent artifacts and simplify build file generation

* Fix maven_install.json

* update regression_testing_install.json

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index c41f0fa..5744045 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -153,6 +153,10 @@
         "io.kubernetes:client-java:4.0.0-beta1",
          # https://github.com/bazelbuild/rules_jvm_external/issues/199
         "com.google.ar.sceneform.ux:sceneform-ux:1.10.0",
+        # https://github.com/bazelbuild/rules_jvm_external/issues/119#issuecomment-504704752
+        "com.github.oshi:oshi-parent:3.4.0",
+        "com.github.spinalhdl:spinalhdl-core_2.11:1.3.6",
+        "com.github.spinalhdl:spinalhdl-lib_2.11:1.3.6",
     ],
     repositories = [
         "https://repo1.maven.org/maven2",