Simplify aos::Init

Most of the variants were to deal with core, which has been gone for a
year.  Simplify those all into InitGoogle.

InitGoogle should be renamed to Init at some point.  It does everything
now.

Change-Id: I738ee03e9c5b2e6348ef33302835f915df68011f
diff --git a/y2014/control_loops/drivetrain/drivetrain_main.cc b/y2014/control_loops/drivetrain/drivetrain_main.cc
index c208738..8367ec1 100644
--- a/y2014/control_loops/drivetrain/drivetrain_main.cc
+++ b/y2014/control_loops/drivetrain/drivetrain_main.cc
@@ -6,8 +6,8 @@
 
 using ::frc971::control_loops::drivetrain::DrivetrainLoop;
 
-int main() {
-  ::aos::InitNRT();
+int main(int argc, char **argv) {
+  ::aos::InitGoogle(&argc, &argv);
 
   aos::FlatbufferDetachedBuffer<aos::Configuration> config =
       aos::configuration::ReadConfig("config.json");